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Debt (Summary Of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Current $ 29,957 $ 20,941
Long-term debt, gross 1,608,089 1,627,842
Long-term Debt, Excluding Current Maturities, Total 1,588,263 1,600,373
Accumulated Amortization, Deferred Finance Costs (19,826) (27,469)
Other long term debt instrument [member]    
Debt Instrument [Line Items]    
Current 9,957 941
Long-term debt, gross 3,089 2,842
Term Loan, Interest Payable Monthly At Floating Rate And Principal Payable Quarterly, Due December 2017 [Member]    
Debt Instrument [Line Items]    
Current 20,000 20,000
Long-term debt, gross 305,000 325,000
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