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Debt (Schedule Of Debt) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Apr. 14, 2015
Dec. 31, 2014
Debt Instrument [Line Items]      
Long-term debt $ 1,372,785   $ 1,351,346
Deferred Purchase Payment [Member]      
Debt Instrument [Line Items]      
Deferred purchase payment 0   150,000
Unamortized discount 0   (1,100)
Senior Secured Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Line of credit facility amount outstanding 117,000   0
8.625% Senior Notes [Member]      
Debt Instrument [Line Items]      
Long term debt 0 $ 600,000 600,000
Unamortized discount 0   (3,444)
Seven Point Five Percent Senior Notes [Member]      
Debt Instrument [Line Items]      
Long term debt 600,000   600,000
Debt instrument, unamortized premium 1,360   1,465
6.25% Senior Notes [Member]      
Debt Instrument [Line Items]      
Long term debt 650,000   0
Other Long Term Debt [Member]      
Debt Instrument [Line Items]      
Long term debt $ 4,425   $ 4,425