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Debt:2024 Notes (Details) - USD ($)
$ in Thousands
12 Months Ended
Nov. 01, 2016
Aug. 29, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]          
Loss on extinguishment of debt     $ 0 $ 0 $ (14,304)
5.625% Senior Notes Due 2024 [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount   $ 350,000      
Interest rate   5.625%      
Dividend Restriction, Interest Leverage Ratio (as a Percent)     350.00%    
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)