Stockholders' Equity - Repurchase Program (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	May 11, 2016
Stockholders’ Equity
Maximum value of shares authorized for repurchase under repurchase plan		$ 20,000
Maximum number of shares authorized for repurchase under repurchase program		2,827,105
Shares repurchased and retired (in shares)	0
Value of remaining shares available under repurchase authorization	$ 13,992
Maximum remaining number of shares available under repurchase authorization	1,387,683