Stock-Based Compensation (Narrative) (Details) (USD $)	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Stock-based compensation expense	$ 4,900,000	$ 6,500,000	$ 15,863,000	$ 19,793,000
Stock-based compensation expense, related tax benefits	1,100,000	1,700,000	3,800,000	5,300,000
Options exercisable	5,416,232		5,416,232
Options vested or expected to vest	6,311,157		6,311,157
Stock Options [Member]
Options exercisable	5,416,232		5,416,232
Options unvested			896,000
Options vested or expected to vest	6,311,157		6,311,157
Expected cancellations and forfeitures			1,075
Intrinsic value of options exercised			1,600,000	6,300,000
Remaining unrecognized compensation cost related to stock options	1,400,000		1,400,000
Weighted-average remaining requisite service period, years			0.6
Restricted Stock [Member]
Remaining unrecognized compensation cost related to stock options	$ 19,000,000		$ 19,000,000
Weighted-average remaining requisite service period, years			1.3

The number of shares under options that are expected to be cancelled or forfeited in the future.

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The total amount of options unvested at the end of the reporting period.

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

+ References

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The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years.

+ References

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

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

+ References

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

+ References

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