Stockholders' Equity (Details Textual) (USD $)	1 Months Ended		3 Months Ended						3 Months Ended
	Apr. 25, 2013	Feb. 28, 2013	Mar. 31, 2013 Plan	Mar. 31, 2012	Mar. 31, 2013 Incentive Stock Options [Member]	Mar. 31, 2012 Incentive Stock Options [Member]	Mar. 31, 2013 Restricted Stock [Member]	Dec. 31, 2012 Restricted Stock [Member]	Mar. 31, 2013 Stock Options [Member]	Mar. 31, 2012 Stock Options [Member]	Mar. 31, 2013 Performance Based Restricted Stock Unit [Member]	Mar. 31, 2013 Performance Based Stock Options [Member]	Mar. 31, 2013 Repurchase of Equity [Member]
Stockholders Equity (Textual) [Abstract]
Aggregate intrinsic value price per share							$ 7.95		$ 7.95
Unrecognized stock-based compensation cost							$ 5,700,000		$ 800,000
Weighted average period							29 months
Approximate units of performance restricted stock granted							139,000
Performance criteria met for approximate units							123,501				86,000
Approximate units outstanding							1,020,961	582,212			225,000
Options exercised, aggregate intrinsic value									1,600,000	26,000
Performance-based stock options Cumulative Granted												600,000
Performance-based stock options condition met												200,000
Unvested performance options												400,000
Fair value of Unvested performance options												100,000
Granted, Number of options			0	0
Incremental stock option expense					39,000	89,000
Tax Benefit recognized					0
Average cost of repurchase per share													$ 7.61
Stockholders Equity (Additional Textual) [Abstract]
Number of stock based compensation plans			4
Option available for future grants			800,000
Weighted average vesting period			12 months
Outstanding common stock repurchase program Authorized Amount		25,000,000
Shares repurchased			702,866
Additional stock repurchase program authorized amount			5,400,000
Stock repurchase program average price per share			$ 7.58
Common stock repurchased, shares	1,900,000
Common stock repurchased, value	$ 14,800,000