Long-term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Oct. 30, 2013
Long-term Debt
Long-term debt	$ 1,735,198	$ 1,267,637
Less current maturities of long-term debt	(92,108)	(30,853)
Less net discounts	(686)	(1,056)
Less debt issuance costs, net of accumulated amortization of $13.3 million and $6.8 million, respectively	(23,553)	(25,151)
Long-term debt, net of current maturities	1,618,851	1,210,577
Accumulated amortization for debt issuance costs	13,300	6,800
Senior Secured Credit Facility
Long-term Debt
Long-term debt	1,259,740	807,500
$300 million 5.875% senior unsecured notes due November 1, 2021
Long-term Debt
Long-term debt	300,000	300,000	$ 300,000
Principal amount	$ 300,000
Interest rate (as a percent)	5.875%		5.875%
Other long-term obligations
Long-term Debt
Long-term debt	$ 146,992	135,000
Capital leases
Long-term Debt
Long-term debt	$ 28,466	$ 25,137

For an unclassified balance sheet, the accumulated amortization, as of the reporting date, representing the periodic charge to earnings of deferred costs which are associated with debt obligations existing as of the end of the period.

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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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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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