Income From Continuing Operations Per Common Share (Details) (USD $) In Thousands, except Per Share data	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Numerator:
Income from continuing operations	$ 45,776	$ 17,646	$ 12,345	$ 95,352
Less: Basic income allocable to participating securities	(808)	(159)	(220)	(1,491)
Basic income from continuing operations attributable to common shareholders	44,968	17,487	12,125	93,861
Diluted adjustments to income allocable to participating securities	4		1	16
Diluted income from continuing operations attributable to common shareholders	$ 44,972	$ 17,487	$ 12,126	$ 93,877
Denominator:
Weighted average common shares outstanding - basic	157,997	156,820	157,772	156,608
Effect of dilutive securities:
Employee stock options and SARs	836	1,652	957	1,993
Weighted average common shares - diluted	158,833	158,472	158,729	158,601
Income from continuing operations per common share:
Basic - net income	$ 0.28	$ 0.11	$ 0.08	$ 0.59
Diluted - net income	$ 0.28	$ 0.11	$ 0.08	$ 0.59

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The amount resulting from the "as if" assumption that stock options or restrictive stock units were exercised for purposes of computing the dilutive effect of convertible securities.

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This element represents the income or loss from continuing operations attributable to the parent which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests, if any.

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

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The amount of net income (loss) derived from continuing operations during 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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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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The earnings that is allocated to common stock and participating securities to the extent that each security may share in earnings as if all of the earnings for the period had been distributed.

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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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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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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