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Income Taxes (Details) (USD $)	3 Months Ended		9 Months Ended
Income Taxes (Details) (USD $)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Income Tax Expense (Benefit) [Abstract]
Income tax expense (benefit)	$ 4,624,000	$ (5,384,000)	$ 25,143,000	$ 14,642,000
Income before taxes	17,660,000	39,696,000	102,496,000	149,592,000
Effective income tax rate	26.20%	(13.60%)	24.60%	9.80%
Unrecognized tax benefits	$ 28,000,000		$ 28,000,000		$ 31,900,000

- Definition

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 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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