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Sale of First Choice (Details) (USD $)
 12 Months Ended 0 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Sep. 23, 2011
First Choice [Member]
Dec. 31, 2012
First Choice [Member]
Dec. 31, 2012
First Choice [Member]
Dec. 31, 2012
Other Income [Member]
First Choice [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Sale of Business Segment subject to adjustments of certain componets of working capital       $ 270,000,000      
Sale of Business Segment, Amount received including estimate of components of working capital       329,300,000      
Gain on sale of First Choice 1,012,000 174,925,000 0   174,900,000 174,900,000 1,000,000
Sale of Business Segment Working Capital That Parent Disputed, Portion of Disputed Total Awarded           6,400,000  
Sale of Business Segment Working Capital That Parent Disputed, Disputed Amount           $ 8,200,000