Long-term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Long-term Debt
Long-term debt	$ 1,716,561	$ 1,735,198
Less current maturities of long-term debt	(96,543)	(92,108)
Less net discounts	(669)	(686)
Less debt issuance costs, net of accumulated amortization of $15.1 million and $13.3 million, respectively	(21,479)	(23,553)
Long-term debt, net of current maturities	1,597,870	1,618,851
Other assets	137,759	116,953
Accumulated amortization for debt issuance costs	15,100	13,300
Senior Secured Credit Facility
Long-term Debt
Long-term debt	1,248,766	1,259,740
$300 million 5.875% senior unsecured notes due November 1, 2021
Long-term Debt
Long-term debt	$ 300,000	300,000
Interest rate (as a percent)	5.875%
Principal amount	$ 300,000
Other long-term obligations
Long-term Debt
Long-term debt	139,759	146,992
Capital leases
Long-term Debt
Long-term debt	$ 28,036	$ 28,466

Carrying amount of accumulated amortization of long-term deferred finance costs capitalized at the end of the reporting 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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Face (par) amount of debt instrument at time of issuance.

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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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Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer.

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Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet. Noncurrent assets are expected to be realized or consumed after one year (or 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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