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Stockholders' Equity (Summary Of Activity Related To Stock Option Plans) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2011
years
months
Stockholders' Equity [Abstract] 
Shares Available for Grant, Beginning Balances2,038,502
Shares Available for Grant, Granted(341,474)
Shares Available for Grant, Exercised 
Shares Available for Grant, Ending Balances1,697,028
Options Outstanding, Number of Shares, Beginning Balances2,892,130
Options Outstanding, Number of Shares, Granted341,474
Options Outstanding, Number of Shares, Exercised(621,989)
Options Outstanding, Number of Shares, Ending Balances2,611,615
Options Outstanding, Number of Shares, Vested and exercisable2,611,615
Options Outstanding, Weighted-Average Exercise Price, Beginning Balances$ 36.11
Options Outstanding, Weighted-Average Exercise Price, Granted$ 234.67
Options Outstanding, Weighted-Average Exercise Price, Exercised$ 29.88
Options Outstanding, Weighted-Average Exercise Price, Ending Balances$ 63.55
Options Outstanding, Weighted-Average Exercise Price, Vested and exercisable$ 63.55
Weighted-Average Remaining Contractual Term, Ending Balances (in Years)5.95
Weighted-Average Remaining Contractual Term, Vested and exercisable (in Years)5.95
Aggregate Intrinsic Value, Ending Balances$ 176,151
Aggregate Intrinsic Value, Vested and exercisable$ 176,151