Quarterly report pursuant to Section 13 or 15(d)

Basis of presentation (Details)

v3.3.0.814
Basis of presentation (Details)
 3 Months Ended
Mar. 31, 2015
USD ($)
contract
Sep. 30, 2015
USD ($)
Interim Consolidated Financial Information    
Derivative Number of Contracts | contract 3  
Interest rate swap    
Interim Consolidated Financial Information    
Negative fair value included in accumulated other comprehensive loss, net of tax   $ (1,170,000)
Interest Rate Swap Effective 31 December 2015 through 29 March 2018 [Member]    
Interim Consolidated Financial Information    
Notional amount $ 45,000,000  
Fixed interest rate (as a percent)   6.105%
Interest Rate Swap Effective 31 December 2015 through 29 March 2018 [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Interim Consolidated Financial Information    
Interest rate added to variable rate (as a percent)   4.25%
LIBOR floor (as a percent)   1.00%
Interest Rate Swap Effective 29 March 2018 through 31 March 2020 [Member]    
Interim Consolidated Financial Information    
Notional amount 90,000,000  
Fixed interest rate (as a percent)   6.916%
Interest Rate Swap Effective 29 March 2018 through 31 March 2020 [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Interim Consolidated Financial Information    
Interest rate added to variable rate (as a percent)   4.25%
LIBOR floor (as a percent)   1.00%
Interest Rate Swap Effective 31 March 2020 through 30 June 2021 [Member]    
Interim Consolidated Financial Information    
Notional amount $ 135,000,000  
Fixed interest rate (as a percent)   7.168%
Interest Rate Swap Effective 31 March 2020 through 30 June 2021 [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Interim Consolidated Financial Information    
Interest rate added to variable rate (as a percent)   4.25%
LIBOR floor (as a percent)   1.00%