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Share-based Compensation - Employee Stock Purchase Plan (Details) (Employee Stock Purchase Plan [Member])	12 Months Ended
	Dec. 31, 2013
Employee Stock Purchase Plan [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Percent of market value purchase price	85.00%
Employee maximum witholding percentage	15.00%
Shares of common stock reserved for future issuance	1,200,000
Shares of common stock available for issuance	219,664

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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