Stockholders' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended			1 Months Ended	12 Months Ended
	May 30, 2013	Nov. 22, 2011	Oct. 27, 2010	Feb. 28, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stockholders' Equity
Reverse stock split ratio	0.05
Shares authorized under share repurchase program			$ 25	$ 10
Number of common stock shares repurchased		330,066			0	66,470	266,710
Value of shares of common stock purchased		$ 8.3				$ 1.2	$ 10.6
Purchase price per share (in dollars per share)		$ 25.00
Additional common shares purchased pursuant to the option to increase the size of the offering by 2% of the outstanding shares of common stock		30,066
Percentage of increase in the size of the offering to purchase additional common shares		2.00%
Shares purchased as a percentage of shares outstanding immediately prior to the consummation of the tender offer		5.17%