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Stockholders' Equity and Stock-Based Compensation Plans (Tables)

3 Months Ended

Mar. 31, 2013

Stock Options Plan [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of transactions of the Company's stock option plans

		Number of Options				Weighted Average Exercise Price				Weighted Average Grant-Date Fair Value
Outstanding at December 31, 2012			1,001,241			$	6.27
Granted—at discount			48,083			$	0.00			$	32.14
—at market value			21,053			$	41.31			$	16.09
Exercised			(195,478)			$	2.17
Forfeited			(4,438)			$	22.48
Outstanding at March 31, 2013			870,461			$	7.60

Phantom Share Units PSUs [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summarizes the transactions of the SEUs

		Number of SEUs				Weighted Average Exercise Price				Weighted Average Grant-Date Fair Value
Outstanding at December 31, 2012			623,828			$	2.95
Granted—at discount			45,028			$	0.00			$	32.06
—at market value			6,970			$	41.31			$	16.09
Exercised			(150,171	)		$	2.90
Forfeited			(2,361	)		$	10.38
Outstanding at March 31, 2013			523,294			$	3.18

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- Definition

Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value.

+ References

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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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