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Debt:2024 Notes (Details) - USD ($) $ in Thousands			3 Months Ended		9 Months Ended
	Sep. 01, 2020	Jul. 27, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Aug. 29, 2016
Extinguishment of Debt [Line Items]
Loss on extinguishment of debt			$ (13,968)	$ 0	$ (13,968)	$ 0
5.625% Senior Notes Due 2024 [Member]
Extinguishment of Debt [Line Items]
Extinguishment of Debt, Amount	$ 137,500	$ 212,500	350,000
Loss on extinguishment of debt			(14,000)
Write off of Unamortized Deferred Financing Costs			3,200
Debt extinguishment premiums paid			$ 10,800
5.625% Senior Notes Due 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount							$ 350,000
Interest rate							5.625%
4.875% Senior Notes Due 2030 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 400,000
Interest rate		4.875%

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

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