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Long-Term Debt (Summary Of Long-Term Debt) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Aug. 14, 2013
Debt Instrument [Line Items]
Less unamortized debt issuance costs	$ (5,727)	$ (3,526)
Total notes payable, net	678,231	489,782
Capitalized lease obligations, vehicles, due through 2019	1,151	600
Less current maturities	(40,471)	(222)
Long-term debt, including capitalized lease obligations	$ 638,911	$ 490,160
6% Senior Notes Due 2023
Debt Instrument [Line Items]
Stated interest rate (percent)	6.00%	6.00%
Senior Notes
Debt Instrument [Line Items]
Stated interest rate (percent)	6.00%		6.00%
Unamortized discount	$ 6,042	$ 6,692
Senior Notes | 6% Senior Notes Due 2023
Debt Instrument [Line Items]
Long-term debt, gross	493,958	493,308
Secured Debt | Term Facility | Term Loan Due 2020
Debt Instrument [Line Items]
Long-term debt, gross	$ 190,000	$ 0
Effective interest rate (percent)	3.59%

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt discount.

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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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