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INCOME TAXES: (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
INCOME TAXES:        
Income tax provision $ 166,806 $ 309,973 $ 401,752 $ 628,742
Effective income tax rate (as a percent)     31.90% 35.10%