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Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2013

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Restricted Stock Units Activity

RSU activity for the three months ended March 31, 2013 is summarized as follows:

		Number of Shares				Weighted Average Grant Date Fair Value
Outstanding at December 31, 2012			292,057			$	57.89
Granted			30,719			$	185.75
Forfeited			(8,627	)		$	61.85
Settled			(69,157	)		$	42.33
Outstanding at March 31, 2013			244,992			$	85.37

Summary of Stock Option Activity

Stock option activity for the three months ended March 31, 2013 is summarized as follows:

		Number of Shares				Weighted Average Exercise Price
Outstanding at December 31, 2012			220,349			$	20.03
Exercised			(12,491	)		$	10.08
Forfeited			—			$	—
Outstanding at March 31, 2013			207,858			$	20.63

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- Definition

Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year.

+ References

No definition available.

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- Definition

Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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