Subsidiary Merger Activities (Details) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2011 years	Dec. 31, 2010
Subsidiary Merger Activities [Abstract]
Taxable gain from mergers		$ 77,300,000
Deductible period for stepped-up tax basis (years)	5
Refund of foreign tax credit	26,300,000
Refund of foreign tax credit, period will be recognized (years)	5
Reduction in tax payments		22,200,000
Remaining portion of foreign tax credit	$ 200,000