INCOME TAXES (Details) (USD $)	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
INCOME TAXES
Increase in the balance of unrecognized tax benefits				$ 1,200,000
Amount of unrecognized tax benefits that would, if recognized, affect the effective tax rate	3,600,000			3,600,000		2,300,000
Increase in total unrecognized tax benefits	40,300,000			66,100,000
Reconciliation of the beginning and ending amount of unrecognized tax benefits
Balance, beginning of period				4,318,000	12,659,000	12,659,000
Additions for tax positions of the current year				9,191,000
Additions for tax positions of prior years				61,641,000		106,000
Reductions of tax positions of prior years:
Changes in judgment				(3,498,000)		(8,447,000)
Balance, end of period	71,652,000			71,652,000		4,318,000
Estimated reduction in unrecognized tax benefits due to the expected closure of the appeals process in the next 12 months	16,100,000			16,100,000
Minimum probability of realization of tax benefit for amount to be recognized (as a percent)	50.00%			50.00%
Effective income tax rate (as a percent)	33.50%		32.30%	31.90%	33.90%
Income tax benefit due to change in estimate		3,000,000
Income tax benefit		3,400,000
Effective tax rate without considering benefit due to change in estimate (as a percent)	33.50%			32.80%
Adjustment to deferred income tax liability balance due to adoption of ASU No. 2010-26						279,800,000
Adjustment to income tax expense balance due to adoption of ASU No. 2010-26					$ 10,900,000