Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accounts Payable and Accrued Liabilities, Current [Abstract]
Trade accounts payable	$ 16,606	$ 5,800
Restricted fiduciary funds	14,394	0
Accrued professional fees	500	777
Income taxes payable	2,448	9,266
Due to prior owners of acquired companies re: working capital settlements	0	2,233
Share repurchases accrued	6,352	820
Sales taxes payable	4,489	3,435
Other accrued liabilities	66	712
Accounts payable and accrued liabilities	$ 44,855	$ 23,043