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Stock Based Compensation (Details) (USD $)	3 Months Ended
Stock Based Compensation (Details) (USD $)	Mar. 31, 2014	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 523,000	$ (346,000)
Stock-based compensation expense, tax benefit		462,000
Unrecognized compensation expense	$ 2,300,000
2005 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under plan approved by directors (in shares)	216,000
2005 Equity Incentive Plan [Member] \| Performance Based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under plan approved by directors (in shares)	119,000

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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