Share-Based Compensation (Details 1) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Certain information regarding the Company' s stock-based compensation
Compensation expense, Total	$ 680	$ 521	$ 1,692	$ 919
Deferred tax benefits, Total	206	78	540	176
Realized tax benefits, Total	128		432
Excess tax benefits(shortfall), Total	71		(71)
Stock options		$ 2,497		$ 2,497
Restricted stock		$ 3,366		$ 3,366
Intrinsic value of options exercised	332		367
Fair value of restricted stock vested			1,164	540
Cash received for strike price and tax withholdings			518	199
Shares acquired through cashless exercise	147		147
Value of shares acquired	583		583
Stock Options [Member]
Certain information regarding the Company' s stock-based compensation
Compensation expense, Total	309	202	646	456
Deferred tax benefits, Total	119	78	249	176
Realized tax benefits, Total	128		141
Excess tax benefits(shortfall), Total	71		71
Restricted Stock [Member]
Certain information regarding the Company' s stock-based compensation
Compensation expense, Total	371	319	1,046	463
Deferred tax benefits, Total	87		291
Realized tax benefits, Total			291
Excess tax benefits(shortfall), Total			(142)
Fair value of restricted stock vested

The net amount of deferred income taxes and income tax credits less the tax benefit from exercise of stock options.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Section 45

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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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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Amount of excess tax benefit (tax deficiency) that arises when compensation cost from non-qualified equity-based compensation recognized on the entity's tax return exceeds (is less than) compensation cost from equity-based compensation recognized in financial statements. Excess tax benefit (tax deficiency) reduces (increases) net cash provided by operating activities.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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The weighted average fair value at grant date for nonvested equity-based awards issued 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 fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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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Cash received for strike price and tax withholdings.

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Shares acquired through cashless exercise.

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Value of shares acquired.

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