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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 4) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
M
Dec. 31, 2010
Dec. 31, 2009
Revenue Recognition                      
Estimated Life of an AIR MILES Reward Mile (in months)                 42    
Estimated unredeemed percentage of AIR MILES 28.00%               28.00%    
Gains related to securitization of new credit card receivable portfolios                     $ 4,200,000
Numerator                      
Income from continuing operations         48,605,000 53,059,000 47,320,000 46,654,000 315,286,000 195,638,000 176,719,000
Loss from discontinued operations         (1,901,000)         (1,901,000) (32,985,000)
Net income 65,906,000 93,981,000 69,023,000 86,376,000 46,704,000 53,059,000 47,320,000 46,654,000 315,286,000 193,737,000 143,734,000
Denominator                      
Weighted average shares, basic (in shares)                 50,687,000 52,534,000 55,765,000
Weighted average effect of dilutive securities:                      
Shares from assumed conversion of convertible senior notes                 4,641,000 1,835,000 612,000
Shares from assumed conversion of convertible note warrants (in shares)                 1,510,000    
Net effect of dilutive stock options and unvested restricted stock (in shares)                 966,000 1,341,000 1,329,000
Denominator for diluted calculations (in shares)                 57,804,000 55,710,000 57,706,000
Basic:                      
Income from continuing operations per share         $ 0.94 $ 1.01 $ 0.89 $ 0.89 $ 6.22 $ 3.72 $ 3.17
Loss from discontinued operations per share                   $ (0.03) $ (0.59)
Net income per share (in dollars per share) $ 1.31 $ 1.86 $ 1.35 $ 1.69 $ 0.90 $ 1.01 $ 0.89 $ 0.89 $ 6.22 $ 3.69 $ 2.58
Diluted:                      
Income from continuing operations per share         $ 0.88 $ 0.96 $ 0.83 $ 0.84 $ 5.45 $ 3.51 $ 3.06
Loss from discontinued operations per share                   $ (0.03) $ (0.57)
Net income per share (in dollars per share) $ 1.11 $ 1.60 $ 1.19 $ 1.56 $ 0.84 $ 0.96 $ 0.83 $ 0.84 $ 5.45 $ 3.48 $ 2.49
Aggregate principal amount of convertible security, Convertible Senior Notes due 2013 805,000,000               805,000,000    
Aggregate principal amount of convertible security, Convertible Senior Notes due 2014 345,000,000               345,000,000    
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                 (2,700,000) 3,000,000 (8,800,000)
Advertising Costs                      
Advertising expenses                 129,000,000 115,500,000 92,000,000
Advertising costs incurred for web and catalog retailer VENUE                     $ 700,000