Goodwill and Other Intangible Assets (Narrative) (Details) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Goodwill and Other Intangible Assets
Anticipated amortization of intangible assets in 2012	$ 17,000,000
Anticipated amortization of intangible assets in 2013	17,000,000
Anticipated amortization of intangible assets in 2014	17,000,000
Anticipated amortization of intangible assets in 2015	17,000,000
Increase in goodwill related to acquisitions associated with the preliminary valuation		$ 5,202,000