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Earnings Per Share Data ("EPS") And Stock Based Compensation (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2012 Y	Mar. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average stock options excluded from antidilutive securities	2,700,000
Compensation cost recognized	$ 4,900,000	$ 3,500,000
Compensation cost recognized, after-tax	3,000,000	2,100,000
Unrecognized compensation cost related to unvested options and restricted stock	50,500,000
Unrecognized compensation cost, remaining weighted average vesting period in years	3.1
Stock options granted during period (net of cancellations)	2,902,950
Weighted-average grant date fair value, per share	$ 10.72
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost recognized	577,000	451,000
Compensation cost recognized, after-tax	$ 359,000	$ 277,000
Stock options granted during period (net of cancellations)	54,127
Weighted-average grant date fair value, per share	$ 36.95

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Share-based compensation arrangement by share-based payment award compensation cost net of tax.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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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.

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Equity-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset.

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Net number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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