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Income Taxes, Additional Disclosures (Details) (USD $)	3 Months Ended		6 Months Ended				6 Months Ended	12 Months Ended
Income Taxes, Additional Disclosures (Details) (USD $)	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Jun. 30, 2013 Divestiture Transaction [Member]	Jun. 30, 2012 Federal	Dec. 31, 2012 Federal
Income Tax Disclosure [Abstract]
Effective income tax rate	45.70%	36.90%	45.30%	32.00%
Federal income tax refund received							$ 58,200,000	$ 66,800,000
Current tax liability	$ 183,312,000		$ 183,312,000		$ 35,834,000	$ 128,900,000

- 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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