Share-Based Compensation (Details Textuals) (USD $)	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Years	Jun. 30, 2011
Share-Based Compensation (Textuals) [Abstract]
Stock option granted			0
Aggregate intrinsic value of stock options exercised	$ 97,000		$ 1,200,000
Actual tax benefit realized on options exercised	38,000		488,000
Nonvested common stock awards granted			50,420
Director [Member]
Share-Based Compensation (Textuals) [Abstract]
Nonvested common stock awards granted			14,308
Employee Stock Option [Member]
Share-Based Compensation (Textuals) [Abstract]
Weighted-average period of recognition of unrecognized compensation cost			3.3
Total unrecognized compensation cost	3,500,000		3,500,000
Compensation cost charged against income	269,000	347,000	744,000	694,000
Income tax benefit recognized during the period	105,000	136,000	291,000	271,000
Nonvested Stock Awards [Member]
Share-Based Compensation (Textuals) [Abstract]
Weighted-average period of recognition of unrecognized compensation cost			2.9
Total unrecognized compensation cost	16,500,000		16,500,000
Compensation cost charged against income	3,300,000	1,100,000	7,000,000	1,800,000
Income tax benefit recognized during the period	$ 1,300,000	$ 436,000	$ 2,700,000	$ 717,000

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

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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- 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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- 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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