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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 3) (USD $)
3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 30, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Sep. 30, 2008
Convertible senior notes due 2013
Dec. 31, 2012
Convertible senior notes due 2013
Jun. 30, 2009
Convertible senior notes due 2014
Dec. 31, 2012
Convertible senior notes due 2014
Revenue Recognition                              
Estimated Life of an AIR MILES Reward Mile                 42 months            
Estimated unredeemed percentage of AIR MILES 27.00%               27.00% 28.00%          
Period beyond which interest and fee income accrue on credit card accounts                 90 days            
Period for which interest and fee income accrue until balance, interest and fees paid or charged off                 180 days            
Amortization term of direct loan amortization costs                 1 year            
Numerator                              
Income from continuing operations                 $ 422,256,000 $ 315,286,000 $ 195,638,000        
Loss from discontinued operations                     (1,901,000)        
Net income 83,661,000 119,545,000 103,821,000 115,229,000 65,906,000 93,981,000 69,023,000 86,376,000 422,256,000 315,286,000 193,737,000        
Denominator                              
Weighted average shares, basic                 50,008,000 50,687,000 52,534,000        
Weighted average effect of dilutive securities:                              
Shares from assumed conversion of convertible senior notes                 8,645,000 4,641,000 1,835,000        
Shares from assumed conversion of convertible note warrants                 4,702,000 1,510,000          
Net effect of dilutive stock options and unvested restricted stock (in shares)                 788,000 966,000 1,341,000        
Denominator for diluted calculations (in shares)                 64,143,000 57,804,000 55,710,000        
Basic:                              
Income from continuing operations per share                 $ 8.44 $ 6.22 $ 3.72        
Loss from discontinued operations per share                     $ (0.03)        
Net income per share (in dollars per share) $ 1.68 $ 2.39 $ 2.07 $ 2.30 $ 1.31 $ 1.86 $ 1.35 $ 1.69 $ 8.44 $ 6.22 $ 3.69        
Diluted:                              
Income from continuing operations per share                 $ 6.58 $ 5.45 $ 3.51        
Loss from discontinued operations per share                     $ (0.03)        
Net income per share (in dollars per share) $ 1.27 $ 1.84 $ 1.63 $ 1.86 $ 1.11 $ 1.60 $ 1.19 $ 1.56 $ 6.58 $ 5.45 $ 3.48        
Prepaid forward contracts (in shares)                 1,857,400            
Anti-dilutive warrants excluded from the calculation of net income per share (in shares)                   10,300,000 17,500,000        
Currency Translation                              
Foreign currency (losses) gains recognized                 600,000 (2,700,000) 3,000,000        
Advertising Costs                              
Advertising expenses                 166,100,000 129,000,000 115,500,000        
Debt                              
Amount borrowed                       $ 805,000,000 $ 805,000,000 $ 345,000,000 $ 345,000,000