Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt discount.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Long-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Mar. 08, 2016	Dec. 31, 2015	Apr. 30, 2011
Debt Instrument [Line Items]
Long-term debt	$ 847,995		$ 742,410
7.75% Senior Notes due 2019
Debt Instrument [Line Items]
Long-term debt, gross	500,000		600,000
Unamortized original issue discount	(144)		(241)	$ (500)
Debt issuance costs	(4,405)		(7,349)
Long-term debt	$ 495,451		$ 592,410
Interest rate percentage	7.75%		7.75%
Term Loan Credit Facility
Debt Instrument [Line Items]
Long-term debt, gross	$ 377,196		$ 0
Unamortized original issue discount	(14,961)	$ (16,800)	0
Debt issuance costs	(9,691)		0
Long-term debt	352,544		0
Revolving credit facility, due April 2019
Debt Instrument [Line Items]
Long-term debt	$ 0		$ 150,000