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Debt and obligations under capital lease - Long-term debt and obligations under capital lease (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument    
Loans from banks and other parties collateralized by tangible and intangible personal property and real estate with a maturity of 20 months to seven years (2016 - two to five years), with a weighted average interest rate of 4.11% (2016 - 4.27%) $ 724,208 $ 602,083
Obligations under capital lease 22 19
Total long-term debt and obligations under capital leases 724,230 602,102
Less: Current portion 6,407 5,284
Less: Discount on secured term loan 3,092 1,515
Less: Debt issuance costs 13,979 9,535
Non-current portion of long-term debt and obligations under capital lease $ 700,752 $ 585,768
Weighted average interest rate 4.11% 4.27%
Minimum    
Debt Instrument    
Period of debt repayment 20 months 2 years
Maximum    
Debt Instrument    
Period of debt repayment 7 years 5 years