Long-Term Debt and Revolving Lines of Credit - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt	$ 848,625	$ 847,875
Less: unamortized loan fees	15,623	18,610
Total debt, net of unamortized loan fees	833,002	829,265
Current maturities of long term debt, net of unamortized loan fees	54,316	32,041
Long-term debt, less current maturities, net of unamortized loan fees	778,686	797,224
Term loan A-1
Debt Instrument [Line Items]
Long-term debt	448,625	472,875
Term loan A-2
Debt Instrument [Line Items]
Long-term debt	$ 400,000	$ 375,000