Stockholders' Equity (Details Textual) (USD $)	1 Months Ended	3 Months Ended		6 Months Ended
	Aug. 03, 2012	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Plan	Jun. 30, 2011
Stockholders Equity (Additional Textual) [Abstract]
Aggregate intrinsic value price per share		$ 5.24		$ 5.24
Unrecognized stock-based compensation cost		$ 2,300,000		$ 2,300,000
Approximate units of performance restricted stock granted				180,000
Weighted average vesting period				18 months
Allocated Share-based Compensation Expense		589,691	877,007	1,347,662	1,839,924
Fair value of Unvested performance options		375,000	603,000	375,000	603,000
Stockholders Equity (Textual) [Abstract]
Number of stock based compensation plans				4
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant		1,400,000		1,400,000
Granted, Number of Units		0		0
Implied volatility of publicly traded options for related vesting period				1 year
Outstanding common stock repurchase program Authorized Amount				20,000,000
Additional stock repurchase program authorized amount		16,100,000
Share repurchased		3,113,806
Weighted average fair value of options granted			$ 2.01		$ 2.17
Options exercised, aggregate intrinsic value		850,000	0	876,000	13,000
Weighted average cost per share		$ 5.18		$ 5.18
Repurchase of additional stock at market price	500,000
Maximum [Member]
Stockholders Equity (Additional Textual) [Abstract]
Vesting period				1 year
Minimum [Member]
Stockholders Equity (Additional Textual) [Abstract]
Vesting period				3 years
Incentive Stock Options [Member]
Stockholders Equity (Additional Textual) [Abstract]
Allocated Share-based Compensation Expense		85,000	430,000	200,000	1,400,000
Total unrecognized tax benefit related to the non-qualified disposition of stock options		850,000	0	876,000	13,400
Performance Based Stock Options [Member]
Stockholders Equity (Additional Textual) [Abstract]
Performance-based stock options Cumulative Granted				950,800
Performance Base options Forfeited		0		0	0
Unvested performance options		619,000	259,452	619,000	259,452
Restricted Stock [Member]
Stockholders Equity (Additional Textual) [Abstract]
Aggregate intrinsic value price per share		$ 5.24		$ 5.24
Unrecognized stock-based compensation cost		$ 2,500,000		$ 2,500,000
Weighted average vesting period				17 months