Annual report pursuant to Section 13 and 15(d)

Employee Retirement Plans - Asset Allocation (Details)

v3.3.1.900
Employee Retirement Plans - Asset Allocation (Details) - Pension plan - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Employee retirement plans      
Target (as a percent) 100.00%    
Actual allocation of pension plan assets $ 26,378 $ 26,046 $ 24,638
Weighted-average asset allocation (as a percent) 100.00% 100.00%  
Large Cap Equity      
Employee retirement plans      
Target (as a percent) 37.00%    
Actual allocation of pension plan assets $ 8,819 $ 9,417  
Weighted-average asset allocation (as a percent) 34.00% 36.00%  
Mid Cap Equity      
Employee retirement plans      
Target (as a percent) 4.00%    
Actual allocation of pension plan assets $ 774 $ 1,005  
Weighted-average asset allocation (as a percent) 3.00% 4.00%  
Small Cap Equity      
Employee retirement plans      
Target (as a percent) 3.00%    
Actual allocation of pension plan assets $ 283 $ 1,019  
Weighted-average asset allocation (as a percent) 1.00% 4.00%  
International Equity      
Employee retirement plans      
Target (as a percent) 12.00%    
Actual allocation of pension plan assets $ 2,633 $ 2,546  
Weighted-average asset allocation (as a percent) 10.00% 10.00%  
Emerging markets Equity      
Employee retirement plans      
Target (as a percent) 2.00%    
Actual allocation of pension plan assets $ 640 $ 645  
Weighted-average asset allocation (as a percent) 2.00% 2.00%  
Fixed Income and Cash Equivalents      
Employee retirement plans      
Target (as a percent) 34.00%    
Actual allocation of pension plan assets $ 10,554 $ 8,794  
Weighted-average asset allocation (as a percent) 40.00% 34.00%  
Real Estate      
Employee retirement plans      
Target (as a percent) 8.00%    
Actual allocation of pension plan assets $ 2,675 $ 2,620  
Weighted-average asset allocation (as a percent) 10.00% 10.00%