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Debt (Summary Of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Current   $ 29,957
Long-term debt, gross $ 1,300,000 1,608,089
Unamortized debt issuance costs (15,400) (19,826)
Total debt, net 1,284,600 1,588,263
Senior Notes, Interest Payable Semiannually At 6 3/8%, Due May 2019 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross 500,000 500,000
Senior Notes, Interest Payable Semiannually At 7 1/8%, Due December 2021 [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 800,000 800,000
Term Loan, Interest Payable Monthly At Floating Rate And Principal Payable Quarterly, Due December 2017 [Member]    
Debt Instrument [Line Items]    
Current   20,000
Long-term debt, gross   305,000
Other long term debt instrument [member]    
Debt Instrument [Line Items]    
Current   9,957
Long-term debt, gross   $ 3,089