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Outside Director Stock Compensation Program (Details)	Dec. 31, 2011
Outside Director Stock Compensation Program [Line Items]
Common stock available for issuance	2,500,000
Outside Director Stock Compensation Program [Member]
Outside Director Stock Compensation Program [Line Items]
Shares issued	67,170
Maximum [Member] \| Outside Director Stock Compensation Program [Member]
Outside Director Stock Compensation Program [Line Items]
Common stock available for issuance	165,375

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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