Long-term Debt (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Oct. 30, 2013
Long-term Debt
Debt	$ 1,261,888us-gaap_DebtAndCapitalLeaseObligations	$ 1,052,015us-gaap_DebtAndCapitalLeaseObligations
Less current maturities of long-term debt	(30,853)	(27,598)
Less discount on debt	(1,056)	(1,223)
Long-term debt, net of current maturities	1,229,979	1,023,194
Senior Secured Credit Facility
Long-term Debt
Debt	807,500	750,000
$300 million 5.875% senior unsecured notes due November 1, 2021
Long-term Debt
Debt	300,000	300,000	300,000
Debt instrument interest rate stated percentage	5.875%		5.875%
Other long-term obligations
Long-term Debt
Debt	154,189
Capital leases
Long-term Debt
Debt	$ 199	$ 2,015

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized.

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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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