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Share-Based Payments (Details) (2012 Plan)	3 Months Ended
Share-Based Payments (Details) (2012 Plan)	Mar. 31, 2013 item
Share-based payments
Maximum number of shares of common stock provided for issuance	2,500,000
Stock option
Share-based payments
Number of annual installments in which the awards would generally vest starting on the first anniversary of the date of grant	4
Contractual term	10 years

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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