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INCOME TAXES: (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
INCOME TAXES:
Income tax provision	$ 219,802	$ 252,507	$ 848,544	$ 792,523
Effective income tax rate (as a percent)			38.20%	30.50%
Increase in effective tax rate (as a percent)			4.70%

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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