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Share-Based Compensation (Details 1) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Certain information regarding the Company' s share-based compensation
Compensation expense Total	$ 1,168	$ 1,012
Deferred tax benefits, Total	286	334
Realized tax benefits, Total	434	305
Excess tax (benefits) shortfall from stock-based compensation	(151)	(142)
Weighted average fair value per share, Restricted stock grants
Intrinsic value of options exercised	156	35
Cash received for strike price and tax withholdings		518
Shares acquired through cashless exercise (1)	399
Value of shares acquired	1,852
Stock Options [Member]
Certain information regarding the Company' s share-based compensation
Compensation expense, Stock options	305	337
Deferred tax benefits, Total	117	130
Realized tax benefits, Total	60	14
Excess tax (benefits) shortfall from stock-based compensation	(92)
Weighted average fair value per share, Stock option grants	$ 0.37
Restricted Stock [Member]
Certain information regarding the Company' s share-based compensation
Compensation expense, Restricted Stock	863	675
Deferred tax benefits, Total	169	204
Realized tax benefits, Total	374	291
Excess tax (benefits) shortfall from stock-based compensation	(59)	(142)
Weighted average fair value per share, Restricted stock grants
Fair value of restricted stock vested	$ 2,548	$ 1,164

X

- Definition

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

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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 noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation.

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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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The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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Cash received for strike price and tax withholdings.

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