Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Details)

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Commitments and Contingencies (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Nov. 15, 2011
State
Summary of future minimum lease payments abstract          
2012,Capital lease $ 19,000 $ 19,000      
2013,Capital lease 10,000 10,000      
2014,Capital lease 0 0      
2015,Capital lease 0 0      
2016,Capital lease 0 0      
Thereafter, Capital lease 0 0      
Total, Capital lease 29,000 29,000      
2012,Operating lease 99,750,000 99,750,000      
2013,Operating lease 92,559,000 92,559,000      
2014,Operating lease 84,451,000 84,451,000      
2015,Operating lease 79,565,000 79,565,000      
2016,Operating lease 71,986,000 71,986,000      
Thereafter, Operating lease 375,171,000 375,171,000      
Total, Operating lease 803,482,000 803,482,000      
Commitments and contingencies (Textual) [Abstract]          
Rent expenses   85,000,000 74,500,000 65,900,000  
Number of States comprised related to discussion with group         44
Reserved cost and potential exposure related to litigation and regulatory matters 45,000,000 45,000,000      
Legal and professional fees   5,000,000      
Expenses related to loss contingency range of possible loss 5,000,000        
Minimum percentage of interest bearing open purchase arrangements   0.00%      
Maximum percentage of interest bearing open purchase arrangements   1.50%      
Minimum financing days of interest bearing open purchase arrangements   30 days      
Maximum financing days of interest bearing open purchase arrangements   60 days      
Amounts outstanding under interest bearing open purchase arrangements 71,800,000 71,800,000 111,100,000    
Interest expense under interest bearing open purchase arrangements   3,200,000 2,100,000 3,300,000  
Open purchase commitments $ 275,400,000 $ 275,400,000