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Long-Term Debt (Schedule Of Future Payments Related To Long-Term Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
2016, Principal $ 161,356  
2016, Interest 46,392  
2016, Principal and Interest Total 207,748  
2017, Principal 2,800  
2017, Interest 33,500  
2017, Principal and Interest Total 36,300  
2018, Principal 3,588  
2018, Interest 33,224  
2018, Principal and Interest Total 36,812  
2019, Principal 3,625  
2019, Interest 32,929  
2019, Principal and Interest Total 36,554  
2020, Principal 3,173  
2020, Interest 32,647  
2020, Principal and Interest Total 35,820  
Thereafter, Principal 485,830  
Thereafter, Interest 96,641  
Thereafter, Principal and Interest Total 582,471  
Total payments, Principal 660,372  
Total payments, Interest 275,333  
Total payments, Principal and future interest expense 935,705  
Interest (275,333)  
Long-term debt 656,342 $ 767,236
2023 Notes [Member]    
Debt Instrument [Line Items]    
Discount on Notes (6,915)  
Premium on Notes 2,640  
2016 Notes [Member]    
Debt Instrument [Line Items]    
Premium on Notes $ 245