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Long-term debt (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Apr. 30, 2017
Sep. 27, 2013
Debt Instrument [Line Items]        
Finance lease obligations $ 5,419      
Finance lease obligations   $ 6,503    
Other long-term borrowings 13,284 16,676    
Subtotal 631,772 636,248    
Deferred financing costs (3,397) (4,019)    
Total 626,808 630,260    
Current portion of long-term debt 3,233 3,836    
Long-term debt, excluding current portion 623,575 626,424    
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 (2,504) (3,156)    
Premium on 2023 Notes $ 937 $ 1,187    
Deferred financing costs       $ (3,313)