Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Accounts Payable and Accrued Expenses
Trade accounts payable	$ 49,074	$ 42,692
Accrued compensation, benefits and payroll taxes	7,023	8,423
Accrued cost of sales	7,559	5,127
Other payables and accrued expenses	1,035	2,500
Total accounts payable and accrued expenses	64,691	58,742
Stock-based long-term incentive compensation	$ 0	$ 491