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Employee Stock Purchase Plan (Details) (Employee Stock Purchase Plan ("Plan"), USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Employee Stock Purchase Plan ("Plan")
Employee Stock Purchase Plan
Number of shares allowed to be purchased by employees	1,000,000
Purchase price of the shares with respect to market value (as a percent)	95.00%
Maximum percentage of base compensation	15.00%
Maximum market value	$ 12,000
Number of shares issued under the plan	410,000	391,000

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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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

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