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Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2012

Stock-based Compensation [Abstract]

Summary of restricted stock units activity

RSU activity for the nine months ended September 30, 2012 is summarized as follows:

		Number of Shares				Weighted Average Grant Date Fair Value
Outstanding at December 31, 2011			576,704			$	24.16
Granted			80,133			$	81.32
Forfeited			(3,133	)		$	42.91
Settled			(374,675	)		$	13.35
Outstanding at September 30, 2012			279,029			$	54.94

Summary of stock option activity

Stock option activity for the nine months ended September 30, 2012 is summarized as follows:

		Number of Shares				Weighted Average Exercise Price
Outstanding at December 31, 2011			352,942			$	20.21
Exercised			(87,463	)		$	20.43
Forfeited			(1,563	)		$	28.58
Outstanding at September 30, 2012			263,916			$	20.09

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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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