Net Income Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Numerator for Basic and Diluted Earnings per Share - [Abstract]
Net Income	$ 324,009	$ 133,973
Denominator for Basic Earnings per Share - [Abstract]
Weighted Average Shares	266,674,000	255,200,000
Potential Dilutive Common Shares -[Abstract]
Stock Options/SARs	1,800,000	1,937,000
Restricted Stock and Restricted Stock Units	1,768,000	1,682,000
Denominator for Diluted Earnings per Share - [Abstract]
Adjusted Diluted Weighted Average Shares	270,242,000	258,819,000
Net Income Per Share [Abstract]
Basic	$ 1.22	$ 0.52
Diluted	$ 1.20	$ 0.52
Antidilutive Stock Options and SARs excluded from Diluted Earnings Per Share Calculation	100,000	200,000

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Aggregate awards of share options and nonvested shares to be issued under a share-based compensation arrangement are considered options for purposes of diluted earnings per share (DEPS). Share-based awards considered outstanding at grant date when computing DEPS although exercise may be vesting contingent. Share-based awards are included in DEPS computation even if employee may not receive (or sell) the stock until future date. All shares to be issued shall be included in computing DEPS, if dilutive.

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No definition available.

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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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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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