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Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Oct. 31, 2013
Debt Instrument [Line Items]
Total debt	$ 488,024	$ 518,711
Unamortized debt premium	1,075	1,176
Debt issuance cost	(2,845)	(3,121)
Less: current maturities	(108)	(1,167)
Long-term debt	487,916	517,544
6.25% Senior Notes due October 2021
Debt Instrument [Line Items]
Total debt	$ 400,000	400,000
Debt stated interest rate	6.25%		6.25%
Other debt
Debt Instrument [Line Items]
Total debt	$ 794	1,656
2017 Credit Facility | Senior secured revolving credit facility
Debt Instrument [Line Items]
Total debt	$ 89,000	$ 119,000

X

- Definition

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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Amount, after accumulated amortization, of debt premium.

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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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