Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accounts Payable and Accrued Liabilities, Current [Abstract]
Trade accounts payable	$ 69,101	$ 16,606
Accrued professional fees	420	500
Income taxes payable	1,598	2,448
Share repurchases accrued	0	6,352
Sales taxes payable	3,615	4,489
Other accrued liabilities	339	66
Accounts payable and accrued liabilities	$ 75,073	$ 30,461