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Accrued and other liabilities: (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Accrued and other current liabilities    
Operating accruals $ 24,356 $ 19,469
Deferred revenue -current portion 4,334 4,303
Payroll and benefits 4,170 3,455
Taxes -non-income based 4,037 3,347
Interest 10,252 7,781
Total $ 47,149 $ 38,355