Long-Term Debt - Summary of Long-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Long-term debt	$ 1,474,517
Capital lease obligations	13,996	$ 11,316
Less: Unamortized debt issuance costs and discounts	(32,274)	(30,622)
Total debt	1,442,243	1,255,359
Less: Current maturities	27,822	27,247
Total long-term debt	1,414,421	1,228,112
Line of Credit \| 2014 Revolver Loan
Debt Instrument [Line Items]
Long-term debt	85,000	125,250
Line of Credit \| 2014 First Lien Term Loans
Debt Instrument [Line Items]
Long-term debt	932,000	861,300
Line of Credit \| 2014 Second Lien Credit Agreement
Debt Instrument [Line Items]
Long-term debt	0	246,500
Senior Unsecured Notes
Debt Instrument [Line Items]
Long-term debt	400,000	0
Subordinated Notes
Debt Instrument [Line Items]
Long-term debt	1,000	1,000
Notes payable and secured loans
Debt Instrument [Line Items]
Long-term debt	$ 42,521	$ 40,615

Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

+ References

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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Amount of long-term debt and capital lease obligations including current maturities.

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