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Long-Term Debt (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Apr. 30, 2017
Dec. 31, 2016
Sep. 27, 2013
Debt Instrument [Line Items]        
Capital lease obligations $ 4,539   $ 4,704  
Other long-term borrowings 22,900   25,553  
Subtotal 640,508   591,286  
Fair value adjustment related to Secured loan agreement 0   (2,877)  
Deferred financing costs (4,641)   (5,611)  
Total 633,501   579,679  
Current portion of long-term debt 4,359   28,099  
Long-term debt, excluding current portion 629,142   551,580  
2027 Notes [Member]        
Debt Instrument [Line Items]        
Notes payable 265,000   0  
Deferred financing costs   $ (3,001)    
2023 Notes [Member]        
Debt Instrument [Line Items]        
Notes payable 348,069   393,767  
Discount on Notes (3,804)   (5,029)  
Premium on Notes 1,438   1,910  
Deferred financing costs       $ (3,313)
Secured Loan Agreement [Member]        
Debt Instrument [Line Items]        
Long-term debt $ 0   $ 167,262