Stock-based Compensation (Details Narrative) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011 Year	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period, Minimum	P6M
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period, Maximum	P5Y
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Term	10 years
Allocated Share-based Compensation Expense	$ 8,319	$ 7,655	$ 4,208
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	3,155	2,903	1,596
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	8,056	0	0
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	8,410
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	2.11
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options	27,909	5,013	5,858
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	$ 14,263	$ 1,854	$ 1,369
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 7.50	$ 5.64	$ 3.70

Share Based Compensation Arrangement By Share Based Payment Award Maximum Term

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Tax benefit associated with any equity-based compensation plan other than an employee stock ownership plan (ESOP). The tax benefit results from the deduction by the entity on its tax return for an award of stock that exceeds the cumulative compensation cost for common stock or preferred stock recognized for financial reporting. Includes any resulting tax benefit that exceeds the previously recognized deferred tax asset (excess tax benefits).

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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The maximum vesting term over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition.

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The minimum vesting term over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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