Goodwill and Other Intangible Assets (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Goodwill [Line Items]
Amortization of other intangible assets	$ 4,767,000	$ 4,277,000
Future amortization expense recognized in remainder of current year	16,900,000
Future amortization expense 2013	22,400,000
Future amortization expense 2014	16,100,000
Future amortization expense 2015	12,300,000
Future amortization expense 2016	9,100,000
Blaze Acquisition [Member]
Goodwill [Line Items]
Business Acquisition, Purchase Price Allocation, Goodwill Amount	15,100,000
Identifiable intangible assets	$ 5,100,000