Long-term Debt (Schedule of Long-term Debt) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Feb. 14, 2013
Debt Instrument [Line Items]
Total long-term debt	$ 904,366	$ 904,770
Less: current portion	(6,400)	(6,400)
Total long-term debt, net of current portion	897,966	898,370
Term Loan, due 2019 (weighted average rate of 7.50%)
Debt Instrument [Line Items]
Term Loan, due 2019 (weighted average rate of 7.50%)	614,400	616,000
Discount on Term Loan	(6,980)	(7,834)
Debt issuance costs	$ (3,054)	(3,396)
Weighted average interest rate	7.50%
Notes, 8.75%, due 2019
Debt Instrument [Line Items]
Notes, 8.75%, due 2019	$ 300,000	$ 300,000
Stated interest rate	8.75%		8.75%

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Amount, after accumulated amortization, of debt discount.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Weighted average interest rate of long-term debt outstanding.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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Carrying value as of the balance sheet date of the portion of long-term, collateralized debt obligations due within one year or the operating cycle, if longer. Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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Carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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