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Sale of First Choice (Details) (USD $)
 9 Months Ended 0 Months Ended 1 Months Ended 3 Months Ended 3 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Nov. 01, 2011
First Choice [Member]
Aug. 31, 2012
First Choice [Member]
Sep. 30, 2012
First Choice [Member]
Oct. 31, 2011
First Choice [Member]
Sep. 23, 2011
First Choice [Member]
Sep. 30, 2012
Other Income [Member]
First Choice [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Discontiuned Operations, Agreed Upon Sale Price             $ 270,000,000  
Proceeds from sale of First Choice 4,034,000 0 329,300,000          
Gain on sale of business segment         174,900,000     1,000,000
Working capital that purchaser disputing is overstated           2,400,000    
Working capital that parent is disputing is understated           (5,800,000)    
Portion of disputed total awarded       6,400,000        
Disputed amount       $ 8,200,000