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Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
Income Taxes (Details) (USD $)	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Income Tax Expense (Benefit) [Abstract]
Income tax expense	$ 14,305,000	$ 12,301,000	$ 20,519,000	$ 20,026,000
Income before taxes	49,661,000	73,825,000	84,836,000	109,896,000
Effective income tax rate	28.80%	16.70%	24.20%	18.20%
Unrecognized tax benefits	$ 27,900,000		$ 27,900,000		$ 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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