Variable Interest Entities (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Receivables [Abstract]
Assets	$ 8,800	$ 11,700
Liabilities	1,800	3,300
Equity	7,000	8,400
Revenue	8,900	10,900
Expenses	1,500	1,400
Net income	$ 7,400	$ 9,500