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Long-term debt (Schedule of Future Payments Related to Long-Term Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
2019, Principal $ 3,836  
2019, Interest 40,537  
2019, Principal and Interest Total 44,373  
2020, Principal 3,355  
2020, Interest 40,243  
2020, Principal and Interest Total 43,598  
2021, Principal 3,298  
2021, Interest 39,941  
2021, Principal and Interest Total 43,239  
2022, Principal 3,493  
2022, Interest 39,598  
2022, Principal and Interest Total 43,091  
2023, Principal 351,074  
2023, Interest 39,314  
2023, Principal and Interest Total 390,388  
Thereafter, Principal 271,192  
Thereafter, Interest 57,175  
Thereafter, Principal and Interest Total 328,367  
Total payments, Principal 636,248  
Total payments, Interest 256,808  
Total payments, Principal and future interest expense 893,056  
Interest (256,808)  
Deferred financing costs (4,019) $ (4,641)
Long-term debt 630,260 $ 633,501
2023 Notes    
Debt Instrument [Line Items]    
Discount on 2023 Notes (3,156)  
Premium on 2023 Notes $ 1,187