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Long-Term Debt (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Sep. 27, 2013
Jul. 13, 2011
Debt Instrument [Line Items]        
Capital lease obligations $ 4,704 $ 5,599    
Other long-term borrowings 25,553 22,465    
Subtotal 591,286 660,375    
Fair value adjustment related to Secured loan agreement (2,877) 0    
Deferred financing costs (5,611) (3,775)    
Total 579,679 652,567    
Current portion of long-term debt 28,099 161,240    
Long-term debt, excluding current portion 551,580 491,327    
2023 Notes [Member]        
Debt Instrument [Line Items]        
Notes payable 393,767 473,767    
Discount on Notes (5,029) (6,918)    
Premium on Notes 1,910 2,640    
Deferred financing costs     $ (3,313)  
2016 Notes [Member]        
Debt Instrument [Line Items]        
Notes payable 0 158,544    
Premium on Notes 0 245    
Deferred financing costs       $ (3,699)
Secured Loan Agreement [Member]        
Debt Instrument [Line Items]        
Long-term debt $ 167,262 $ 0