Share-Based Compensation (Details Textuals) (USD $)	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Share-Based Compensation (Textuals) [Abstract]
Stock option granted			0
Aggregate intrinsic value of stock options exercised	$ 1,300,000		$ 2,100,000
Actual tax benefit realized on options exercised	513,000		833,000
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 256 days
Total unrecognized compensation cost	4,500,000		4,500,000
Compensation cost charged against income	490,000	269,000	1,100,000	744,000
Income tax benefit recognized during the period	192,000	105,000	428,000	291,000
Nonvested Stock Awards [Member]
Share-Based Compensation (Textuals) [Abstract]
Weighted-average period of recognition of unrecognized compensation cost			2 years 176 days
Total unrecognized compensation cost	13,900,000		13,900,000
Compensation cost charged against income	2,400,000	3,300,000	5,000,000	7,000,000
Income tax benefit recognized during the period	940,000	1,300,000	1,900,000	2,700,000
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 58 days
Total unrecognized compensation cost	3,300,000		3,300,000
Compensation cost charged against income	760,000		1,400,000	0
Income tax benefit recognized during the period	$ 297,000		$ 533,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	0

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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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

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- Definition

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.

+ References

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- Definition

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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- Definition

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

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- Definition

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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- Definition

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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- Definition

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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- Definition

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

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