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Stock Based Awards and Other Equity Instruments (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Options Outstanding  
Options Outstanding, Beginning balance 6,575
Granted 3,651
Exercised 1,151
Cancelled 421
Options Outstanding, Ending balance 8,654
Options Exercisable, Ending balance 3,329
Options Vested and expected to vest, Ending balance 7,655
Weighted Average Exercise Price, Remaining Contractual Life and Aggregate Intrinsic Value  
Options Outstanding, Weighted Average Exercise Price, Beginning balance $ 23.65
Granted $ 39.79
Exercised $ 14.09
Cancelled $ 29.42
Options Outstanding, Weighted Average Exercise Price, Ending balance $ 31.41
Options Exercisable, Weighted Average Exercise Price, Ending balance $ 27.23
Options Vested and expected to vest, Weighted Average Exercise Price, Ending balance $ 30.65
Options Outstanding, Weighted Average Remaining Contractual Life, Ending balance 5 years 8 months 12 days
Options Exercisable, Weighted Average Remaining Contractual Life, Ending balance 3 years 1 month 6 days
Options Vested and expected to vest, Weighted Average Remaining Contractual Life, Ending balance 5 years 8 months 12 days
Options Exercised, Aggregate Intrinsic Value $ 25,074
Options Outstanding, Aggregate Intrinsic Value, Ending balance 92,083
Options Exercisable, Aggregate Intrinsic Value, Ending balance 49,016
Options Vested and expected to vest, Aggregate Intrinsic Value, Ending balance $ 86,121