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Subsequent Event (Estimated Fair Values Of The Aggregate Assets And Liabilities Acquired) (Details) (USD $)
Dec. 31, 2011
Dec. 31, 2010
Subsequent Event [Line Items]    
Cash $ 5,170,000 $ 1,000,000
Other current assets 5,835,000 2,558,000
Fixed assets 1,075,000 891,000
Goodwill 128,344,000 116,393,000
Purchased customer accounts 73,868,000 65,476,000
Non-compete agreements 506,000 460,000
Other assets 24,000 5,000
Total assets acquired 214,822,000 186,783,000
Other current liabilities (11,133,000) (2,298,000)
Deferred income taxes, net 1,455,000  
Total liabilities assumed (15,659,000) (2,298,000)
Net assets acquired 199,163,000 184,485,000
Arrowhead [Member]
    
Subsequent Event [Line Items]    
Cash 61,221,000  
Other current assets 68,439,000  
Fixed assets 4,751,000  
Goodwill 304,974,000  
Purchased customer accounts 126,431,000  
Non-compete agreements 100,000  
Other assets 14,851,000  
Total assets acquired 580,767,000  
Other current liabilities (126,095,000)  
Deferred income taxes, net (52,809,000)  
Total liabilities assumed (178,904,000)  
Net assets acquired $ 401,863,000