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Debt:2024 Notes (Details) - USD ($) $ in Thousands			3 Months Ended		12 Months Ended
	Nov. 01, 2016	Aug. 29, 2016	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Loss on extinguishment of debt			$ (3,000)	$ (5,900)	$ 0	$ (14,304)	$ 0
5.625% Senior Notes Due 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 350,000
Interest rate		5.625%			5.625%
Dividend restriction, consolidated coverage ratio (as a percent)					200.00%
6.375% Senior Notes Due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 300,000
Interest rate		6.375%
Extinguishment of Debt, Amount	$ 115,500	$ 184,500
Loss on extinguishment of debt						(14,300)
Debt extinguishment premiums paid						(11,300)
Write off of Deferred Debt Issuance Cost						$ (3,000)

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Premiums paid related to debt extinguishment.

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Minimum interest coverage ratio. If that percentage is met, there is no restriction upon the payment of dividends.

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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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Gross amount of debt extinguished.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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