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Trade Accounts Receivable - Schedule of Changes in Allowance for Doubtful Accounts Receivable (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Receivables [Abstract]          
Balance at beginning of year     $ 2,083 $ 189 $ 189
Provision for bad debts $ 1,634 $ 5 2,617 $ 5 4,686
Allowance from acquired business     1,000  
Deductions and write-offs, net of foreign currency adjustment     (3,207)   (2,792)
Balance at end of year $ 2,493   $ 2,493   $ 2,083