Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2013	Dec. 31, 2015	Aug. 29, 2011
Equity, Class of Treasury Stock [Line Items]
Number of shares authorized and available for repurchase (in shares)	540,000			100,000
Treasury stock, shares (in shares)	81,584		79,664
Value of repurchased common stock	$ 580		$ 572
Number of warrants received for each share of common stock (in shares)		5
Number of warrants that entitle holder to purchase one share of common stock (in shares)		25
Warrant exercise price (in dollars per share)		$ 7.50
Minimum volume weighted average price per share (in dollars per share)		$ 15.00
Additional shares sold through exercise by underwriter of over-allotment option (in shares)	0
Total warrants distributed (in shares)		12,981,025