Share-Based Compensation (Details Textuals) (USD $)	3 Months Ended	9 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Share-Based Compensation (Textuals) [Abstract]
Stock option granted			0
Aggregate intrinsic value of stock options exercised	$ 7,500,000		$ 9,700,000
Actual tax benefit realized on options exercised	3,000,000		3,800,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			12,052
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period			3 years
Employee Stock Option [Member]
Share-Based Compensation (Textuals) [Abstract]
Weighted-average period of recognition of unrecognized compensation cost			2 years 146 days
Total unrecognized compensation cost	4,100,000		4,100,000
Compensation cost charged against income	436,000	362,000	1,500,000	1,100,000
Income tax benefit recognized during the period	171,000	142,000	599,000	433,000
Nonvested Stock Awards [Member]
Share-Based Compensation (Textuals) [Abstract]
Weighted-average period of recognition of unrecognized compensation cost			2 years 110 days
Total unrecognized compensation cost	12,100,000		12,100,000
Compensation cost charged against income	1,800,000	2,100,000	6,700,000	9,100,000
Income tax benefit recognized during the period	700,000	805,000	2,600,000	3,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			12,000
Restricted Stock Units (RSUs) [Member]
Share-Based Compensation (Textuals) [Abstract]
Weighted-average period of recognition of unrecognized compensation cost			3 years 259 days
Total unrecognized compensation cost	10,700,000		10,700,000
Compensation cost charged against income	696,000	279,000	2,100,000	279,000
Income tax benefit recognized during the period	$ 273,000	$ 109,000	$ 806,000	$ 109,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	292,478
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period			4 years

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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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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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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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Net number of share options (or share units) granted during the period.

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