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Stock-Based Compensation (Details 2) (USD $)	3 Months Ended
	Mar. 31, 2013
Summary of changes in unvested options
Weighted-average exercise price per share, Beginning balance	$ 19.59
Weighted-average exercise price per share, Granted
Weighted-average exercise price per share, Ending balance	$ 19.70
Unvested stock options [Member]
Summary of changes in unvested options
Number of options, Beginning balance	64,503
Number of options, Granted
Number of options, Vested	(13,037)
Number of options, Cancelled
Number of options, Ending balance	51,466
Weighted-average exercise price per share, Beginning balance	$ 10.86
Weighted-average exercise price per share, Granted
Weighted-average exercise price per share, Vested	$ 11.86
Weighted-average exercise price per share, Cancelled
Weighted-average exercise price per share, Ending balance	$ 10.61
Weighted-average grant date fair value per option, Beginning balance	$ 8.67
Weighted-Average Grant Date Fair Value per option, Granted
Weighted-Average Grant Date Fair Value per option, Vested	$ 9.54
Weighted-Average Grant Date Fair Value per option, Cancelled
Weighted-average grant date fair Value per option, Ending balance	$ 8.45

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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