Stockholders' Equity (Details Textual) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Plan	Sep. 30, 2011
Stockholders Equity (Additional Textual) [Abstract]
Aggregate intrinsic value price per share	$ 6.04		$ 6.04
Unrecognized stock-based compensation cost	$ 1,300,000		$ 1,300,000
Weighted average vesting period			16 months
Allocated Share-based Compensation Expense	849,388	693,520	2,197,050	2,533,444
Fair value of Unvested performance options	200,000	500,000	200,000	500,000
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	1,300,000		1,300,000
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			20,000,000
Share repurchased			3,800,000
Weighted average fair value of options granted		$ 1.97		$ 2.16
Options exercised, aggregate intrinsic value	700,000	49,000	1,600,000	63,000
Weighted average cost per share			$ 5.22
Maximum [Member]
Stockholders Equity (Additional Textual) [Abstract]
Vesting period			3 years
Minimum [Member]
Stockholders Equity (Additional Textual) [Abstract]
Vesting period			1 year
Incentive Stock Options [Member]
Stockholders Equity (Additional Textual) [Abstract]
Allocated Share-based Compensation Expense	98,000	251,000	300,000	1,200,000
Total unrecognized tax benefit related to the non-qualified disposition of stock options	0	49,000	0	63,000
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	0
Unvested performance options	473,000	219,000	473,000	219,000
Restricted Stock [Member]
Stockholders Equity (Additional Textual) [Abstract]
Aggregate intrinsic value price per share	$ 6.04		$ 6.04
Unrecognized stock-based compensation cost	$ 2,200,000		$ 2,200,000
Approximate units of performance restricted stock granted			180,000
Weighted average vesting period			14 months