Stockholders' Equity (Details) (USD $)	1 Months Ended			12 Months Ended				1 Months Ended	12 Months Ended	1 Months Ended				1 Months Ended
	Feb. 29, 2012	Oct. 31, 2011	Jun. 30, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2008 Fund	Nov. 30, 2011 Warrant [Member]	Dec. 31, 2008 Warrant [Member]	Jan. 31, 2011 Series B Preferred Stock [Member]	Dec. 31, 2008 Series B Preferred Stock [Member]	Dec. 31, 2012 Common Stock Voting [Member]	Dec. 31, 2011 Common Stock Voting [Member]	Feb. 29, 2012 Common Stock Non-Voting [Member]	Dec. 31, 2012 Common Stock Non-Voting [Member]	Dec. 31, 2011 Common Stock Non-Voting [Member]
Class of Stock [Line Items]
Common stock, shares authorized												110,000,000	110,000,000		10,000,000	10,000,000
Common stock shares repurchased			1,939,620	955,342										1,821,730
Common stock shares repurchased				717,344
Purchase of treasury stock			$ 30,000,000		$ (6,935,000)	$ (30,000,000)								$ 52,900,000
Conversion of non voting common stock to voting common stock	763,924
Series B Preferred Stock, shares authorized											35,000
Shares of common stock									3,500,000	3,499,999
Common stock, shares issued								455,465
Stockholders' Equity (Textual) [Abstract]
Common stock entitles				One
Authorized a share repurchase program		35,000,000	30,000,000
Securities purchase agreement funds managed							2
Warrants to purchase shares, common stock							700,000
Common stock at an exercise price							10.00
Aggregate purchase price							35,000,000
Placement agent fee and legal fees							33,500,000
Shares conversion price							$ 10.00
Closing price of the common stock							$ 17.50
Consecutive trading days							65 days
Quarterly cash dividend				$ 1.74	$ 0.36	$ 0.28
Special dividend paid				$ 1.30