Stockholders' Equity (Details 3) (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Oct. 23, 2002
Stockholders' Equity
Number of shares of outstanding common stock authorized to be repurchased			3,000,000
Purchases made pursuant to repurchase authorization (in shares)	0	0
Number of remaining shares of common stock authorized to be repurchased	1,653,333
Number of common stock shares purchased and retired	61,869	49,590
Amount of common stock purchased and retired	$ 144,000	$ 107,000