Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Investments [Roll Forward]
Beginning Balance	$ 2,195
Ending Balance	2,745	$ 2,195
Venture Capital Fund
Investments [Roll Forward]
Beginning Balance	2,195	1,000
Investment made during period	550	750
Proceeds retained and reinvested in fund		445
Ending Balance	$ 2,745	$ 2,195