Employee Benefit Plans ESPP (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
ESPP [Abstract]
Shares issued pursuant to the ESPP	175	242	381
Cash received for the purchase of shares pursuant to the ESPP	$ 322	$ 514	$ 767
Weighted average purchase price per share	$ 1.84	$ 2.12	$ 2.01