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Income Taxes (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Excess tax benefit on stock-based compensation	$ 73,210	$ 38,786	$ 14,526
Earliest income tax examination year federal	2009
Earliest income tax examination year state	2008
Foreign net operating losses, beginning expiration date	2015
Federal credits to be recognized in Q1 2013	0.50%

X

- Definition

Benefit resulting from changes in the income tax laws or rates that cannot be reflected in the financial statements until the period that the law was enacted.

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- Definition

The earliest tax year the Company is subject to U.S. federal tax examinations by tax authorities.

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- Definition

The earliest tax year the Company is subject to tax examinations by tax authorities for the majority of states where the Company has a significant presence.

+ References

No definition available.

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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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- Definition

The expiration date of each operating loss carryforward included in total operating loss carryforwards, or the applicable range of such expiration dates.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 3

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-Name Statement of Financial Accounting Standard (FAS)

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