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Debt - Long Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Long term Debt [Abstract]    
Debt $ 1,476,214 $ 1,220,369
Less: current portion (22,139) (15,840)
Debt, noncurrent 1,454,075 1,204,529
Notes Payable to Banks [Member] | Term Loans [Member]    
Long term Debt [Abstract]    
Debt 682,223 695,956
Revolving loans [Member]    
Long term Debt [Abstract]    
Debt 2,000 5,500
Senior Subordinated Notes [Member] | 6.875 % Due 2020 [Member]    
Long term Debt [Abstract]    
Debt 519,777 $ 518,913
Senior Subordinated Notes [Member] | 6.125% Due 2022    
Long term Debt [Abstract]    
Debt $ 272,214