Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Summary (Details)

v3.5.0.2
Long-Term Debt - Summary (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Long-term debt        
Term Loan, net of debt discount $ 185,657,000 $ 185,657,000 $ 186,472,000  
Less current maturities 1,629,000 1,629,000 1,629,000  
Long-term Debt, Excluding Current Maturities, Total 181,919,000 181,919,000 182,506,000  
Deferred financing costs, net 2,109,000 2,109,000 2,337,000  
Total long-term debt 181,919,000 181,919,000 182,506,000  
Term loan facility        
Long-term debt        
Less current maturities 1,629,000 1,629,000 1,629,000  
Long-term Debt, Excluding Current Maturities, Total 184,028,000 184,028,000 184,843,000  
Long-term debt, additional disclosure        
Unamortized discount on issuance of debt 1,493,000 1,493,000 1,629,000 $ 1,900,000
Revolving credit facility | Maximum        
Long-term debt, additional disclosure        
Facilities consolidation expenditure allowed   15,000,000    
Senior credit facilities        
Long-term debt, additional disclosure        
Maximum borrowing capacity 10,000,000 10,000,000    
Senior credit facilities | Term loan facility        
Long-term debt, additional disclosure        
Borrowings under senior credit facility $ 190,000,000 $ 190,000,000    
Percentage of net cash proceeds of certain asset sales, certain insurance or condemnation events, requirement for additional principal prepayments 100.00%      
Period before end of the fiscal year, for additional principal prepayments of debt, from excess cash flow 150 days      
Percentage of excess cash flow paid as additional principal prepayments 50.00%      
Reduced percentage of excess cash flow paid as additional principal prepayments upon achievement of certain leverage ratio thresholds, one 0.00%      
Senior credit facilities | Term loan facility | Maximum        
Long-term debt, additional disclosure        
Additional term loan commitments $ 80,000,000      
Debt ratio 3.25 3.25    
Senior credit facilities | Term loan facility | First option | Minimum        
Long-term debt, additional disclosure        
Additional fixed interest rate spread (as a percent) 1.00%      
Additional interest margin added to fixed and variable rates (as a percent) 1.00%      
Senior credit facilities | Term loan facility | First option | Base rate        
Long-term debt, additional disclosure        
Fixed interest rate base (as a percent) 3.25%      
Senior credit facilities | Term loan facility | First option | Federal funds        
Long-term debt, additional disclosure        
Variable rate basis description   Federal funds    
Interest rate added to variable rate (as a percent) 0.50%      
Senior credit facilities | Term loan facility | First option | One month London Interbank Offered Rate        
Long-term debt, additional disclosure        
Variable rate basis description   LIBOR for a one month interest period    
Senior credit facilities | Term loan facility | First option | Prime        
Long-term debt, additional disclosure        
Variable rate basis description   Prime Rate    
Senior credit facilities | Term loan facility | Second option | Minimum        
Long-term debt, additional disclosure        
Additional fixed interest rate spread (as a percent) 1.00%      
Senior credit facilities | Term loan facility | Second option | Base rate        
Long-term debt, additional disclosure        
Fixed interest rate base (as a percent) 4.25%      
Senior credit facilities | Revolving credit facility        
Long-term debt, additional disclosure        
Borrowings under senior credit facility $ 100,000,000 $ 100,000,000    
Outstanding borrowings     $ 0  
Remaining borrowing availability 99,440,000 $ 99,440,000    
Fixed charge coverage ratio to be maintained if certain minimum availability under the credit facility is not maintained.   1.0    
Senior credit facilities | Revolving credit facility | Maximum        
Long-term debt, additional disclosure        
Annual acquisitions allowed   $ 12,500,000    
Senior credit facilities | Revolving credit facility | Fixed rate | Maximum        
Long-term debt, additional disclosure        
Fixed interest rate base (as a percent)   2.00%    
Senior credit facilities | Revolving credit facility | First option | Fixed rate | Minimum        
Long-term debt, additional disclosure        
Fixed interest rate base (as a percent)   1.50%    
Senior credit facilities | Revolving credit facility | Second option | Federal funds        
Long-term debt, additional disclosure        
Variable rate basis description   Federal funds    
Interest rate added to variable rate (as a percent)   0.50%    
Senior credit facilities | Revolving credit facility | Second option | Fixed rate | Maximum        
Long-term debt, additional disclosure        
Fixed interest rate base (as a percent)   1.00%    
Senior credit facilities | Revolving credit facility | Second option | Fixed rate | Minimum        
Long-term debt, additional disclosure        
Fixed interest rate base (as a percent)   0.50%    
Senior credit facilities | Revolving credit facility | Second option | One month London Interbank Offered Rate        
Long-term debt, additional disclosure        
Variable rate basis description   LIBOR for a one month interest period    
Interest rate added to variable rate (as a percent)   1.00%    
Senior credit facilities | Revolving credit facility | Second option | Prime        
Long-term debt, additional disclosure        
Variable rate basis description   Prime Rate    
Revolving credit facility        
Long-term debt, additional disclosure        
Outstanding borrowings 0 $ 0    
Swingline loan        
Long-term debt, additional disclosure        
Maximum borrowing capacity $ 5,000,000 $ 5,000,000