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Long-term debt (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Apr. 30, 2017
Sep. 27, 2013
Debt Instrument [Line Items]        
Capital lease obligations $ 6,503 $ 4,539    
Other long-term borrowings 16,676 22,900    
Subtotal 636,248 640,508    
Deferred financing costs (4,019) (4,641)    
Total 630,260 633,501    
Current portion of long-term debt 3,836 4,359    
Long-term debt, excluding current portion 626,424 629,142    
2027 Notes        
Debt Instrument [Line Items]        
Notes payable 265,000 265,000    
Deferred financing costs     $ (3,001)  
2023 Notes        
Debt Instrument [Line Items]        
Notes payable 348,069 348,069    
Discount on 2023 Notes (3,156) (3,804)    
Premium on 2023 Notes $ 1,187 $ 1,438    
Deferred financing costs       $ (3,313)