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Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
Income Taxes (Details) (USD $)	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Provision for income taxes	$ 6,727,000	$ 9,541,000	$ 12,826,000	$ 21,354,000
Income Loss From Continuing Operations Before Income Taxes	35,296,000	50,288,000	68,658,000	97,054,000
Effective tax rates	19.10%	19.00%	18.70%	22.00%
U.S statutory rate	35.00%	35.00%	35.00%	35.00%
Unrecognized tax benefits that would have a favorable impact on effective tax rate	13,800,000		13,800,000
Minimum [Member]
Reduction of unrecognized tax benefits			1,500,000
Maximum [Member]
Reduction of unrecognized tax benefits			$ 2,500,000

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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