Stock-Based And Long-Term Compensation (Summary Of Stock Option Activity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summarization of stock option activity
Share-based Compensation Arrangement by Share-based Payment Award, Options, Other Increases (Decreases) in Period	2,668,046,000
Number of options outstanding, beginning	4,331,201	5,000,453	3,538,545
Number of options granted	78,043	207,183	1,549,058
Number of options exercised	(1,962,248)	(876,435)	(87,150)
Number of options forfeited	(191,940)
Number of options outstanding, ending	4,923,102	4,331,201	5,000,453
Number of options exercisable	4,513,913
Number of options expected to vest	409,189
Weighted average option price outstanding, beginning	$ 20.70	$ 18.78	$ 15.84
Weighted average option price granted	$ 28.57	$ 28.97	$ 25.04
Weighted average option price excercised	$ 7.53	$ 11.71	$ 10.62
Weighted average option price forfeited	$ 25.63
Weighted average option price outstanding, ending	$ 20.52	$ 20.70	$ 18.78
Weighted average option price exercisable	$ 19.87
Weighted average option price expected to vest	$ 27.66
Weighted average remaining contractual term, outstanding	5 years 3 months 18 days
Weighted average remaining contractual term, exercisable	5 years 1 month 6 days
Weighted average remaining contractual term, expected to vest	8 years 4 months 24 days
Aggregate intrinsic value, outstanding	$ 16,334
Aggregate intrinsic value, exercisable	$ 16,334
Share-based Compensation Arrangements by Share-based Payment Award, Options, Other Share Increase (Decrease) in Period, Weighted Average Exercise Price	$ 10.56

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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The addition or reduction in the number of reserved shares that could potentially be issued under the option plan attributable to reasons other than grants, exercises, forfeitures, and expirations during the reporting period.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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