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Debt (Schedule of Long-Term Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total debt	$ 518,711	$ 507,906
Unamortized debt premium	1,176	1,583
Debt issuance cost	(3,121)	(4,222)
Less: current maturities	(1,167)	(1,156)
Long-term debt	517,544	506,750
Senior unsecured notes due October 2021
Debt Instrument [Line Items]
Total debt	400,000	400,000
Senior secured revolving credit facility
Debt Instrument [Line Items]
Total debt	119,000	108,446
Other debt
Debt Instrument [Line Items]
Total debt	$ 1,656	$ 2,099

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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Amount, after accumulated amortization, of debt premium.

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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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