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Income Taxes (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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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% |  |

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