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Long-Term Debt (Schedule Of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Capital lease obligations $ 5,599 $ 5,652
Other long-term borrowings 22,465 37,645
Total 656,342 767,236
Current portion of long-term debt 161,599 6,156
Long-term debt, excluding current portion 494,743 761,080
2023 Notes [Member]    
Debt Instrument [Line Items]    
Notes payable 469,491 468,976
2016 Notes [Member]    
Debt Instrument [Line Items]    
Notes payable $ 158,787 $ 254,963