INCOME TAXES (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of the beginning and ending amount of unrecognized tax benefits
Balance, beginning of period	$ 85,846,000	$ 74,335,000	$ 4,318,000
Additions for tax positions of the current year	57,392,000	7,464,000	9,465,000
Additions for tax positions of prior years	34,371,000	6,787,000	64,050,000
Reductions of tax positions of prior years:
Changes in judgment	(9,533,000)	(2,740,000)	(3,498,000)
Balance, end of period	168,076,000	85,846,000	74,335,000
Unrecognized tax benefits with high certainty of deductibility but with uncertainty about the timing of deductions	157,300,000	78,500,000
Amount of unrecognized tax benefits that would affect the effective income tax rate if recognized	10,700,000	7,400,000
Accrued interest related to the unrecognized tax benefits included in income tax expense	0	0	0
Accrued interest associated with unrecognized tax benefits	0	0
Estimated period to conclude appeals process for protesting certain unfavorable adjustments in IRS audit	12 months
Potential decrease in total unrecognized tax benefits in the next 12 months	98,400,000
Decrease in uncertain tax position liability		$ 2,700,000
Minimum probability of realization of tax benefit for amount to be recognized (as a percent)	50.00%