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Debt (Schedule of Future Payments) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
2019	$ 1,167
2020	489
2021	519,000
2022	0
2023	0
Thereafter	0
Total future payment	520,656
Add: Unamortized debt premium	1,176	$ 1,583
Less: Debt issuance cost	(3,121)	(4,222)
Total debt	$ 518,711	$ 507,906

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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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Amount, after accumulated amortization, of debt premium.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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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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