STOCK-BASED COMPENSATION (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Common Stock Options, Quantity
Exercised (in shares)	(840,649)	(364,324)	(2,728,000)
Intrinsic value of common stock options, SAR and equity based incentive awards exercised during the period
Stock-based compensation expense recognized	$ 4,779	$ 18,318	$ 34,005
Compensation cost related to unvested granted awards not yet recognized	6,186
Weighted average period of recognition of unrecognized compensation cost related to nonvested awards	2 years 9 months 18 days
Common stock options
Common Stock Options, Quantity
Outstanding at the beginning of the period (in shares)	6,441,310
Granted (in shares)	861,873
Exercised (in shares)	(840,649)
Forfeited (in shares)	(890,624)
Expired (in shares)	(1,993,203)
Outstanding at the end of the period (in shares)	3,578,707	6,441,310
Common Stock Options, Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 17.96
Granted (in dollars per share)	$ 13.85
Exercised (in dollars per share)	$ 5.49
Forfeited (in dollars per share)	$ 16.56
Expired (in dollars per share)	$ 20.97
Outstanding at the end of the period (in dollars per share)	$ 18.58	$ 17.96
Nonvested Common Stock Options, Quantity
Nonvested Common Stock Options at the beginning of the period (in shares)	1,357,191
Granted (in shares)	861,873
Vested (in shares)	(545,938)
Forfeited (in shares)	(890,624)
Nonvested Common Stock Options at the end of the period (in shares)	782,502	1,357,191
Nonvested Common Stock Options, Weighted average grant-date fair value
Nonvested options at the beginning of the period (in dollars per share)	$ 10.13
Granted (in dollars per share)	$ 2.24
Vested (in dollars per share)	$ 10.27
Forfeited (in dollars per share)	$ 4.69
Nonvested options at the end of the period (in dollars per share)	$ 7.53	$ 10.13
Vested Common stock options
Vested Common Stock Options, Quantity (in shares)	2,796,205
Vested Common Stock Options, Weighted Average Exercise Price (in dollars per share)	$ 19.74
Vested Common Stock Options, Weighted Average Remaining Contractual Term	6 years 3 months 18 days
Intrinsic value of common stock options, SAR and equity based incentive awards exercised during the period
Total intrinsic value of options exercised	4,624	2,575	11,651
Equity-based incentive awards
Equity-based incentive awards, Quantity
Outstanding at the beginning of the period (in shares)	2,838,139
Granted (in shares)	405,833
Exercised (in shares)	(12,500)
Forfeited (in shares)	(632,397)
Expired (in shares)	(398,523)
Outstanding at the end of the period (in shares)	2,200,552	2,838,139
Equity-based incentive awards, Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 14.00
Granted (in dollars per share)	$ 14.00
Exercised (in dollars per share)	$ 14.00
Forfeited (in dollars per share)	$ 14.00
Expired (in dollars per share)	$ 14.00
Outstanding at the end of the period (in dollars per share)	$ 14.00	$ 14.00
Nonvested Equity-based incentive awards, Quantity
Outstanding at the beginning of the period (in shares)	943,438
Granted (in shares)	405,833
Vested (in shares)	(397,186)
Forfeited (in shares)	(632,397)
Outstanding at the end of the period (in shares)	319,688	943,438
Nonvested Equity-based incentive awards, Weighted average grant-date fair value
Outstanding at the beginning of the period (in dollars per share)	$ 2.80
Granted (in dollars per share)	$ 2.80
Vested (in dollars per share)	$ 2.80
Forfeited (in dollars per share)	$ 2.80
Outstanding at the end of the period (in dollars per share)	$ 2.80	$ 2.80
Vested Equity-based incentive awards
Vested Equity-based incentive awards, Quantity (in shares)	1,880,864
Vested Equity-based incentive awards, Weighted Average Exercise Price (in dollars per share)	$ 14.00
Vested Equity-based incentive awards, Weighted Average Remaining Contractual Term	6 years 9 months 18 days
Intrinsic value of common stock options, SAR and equity based incentive awards exercised during the period
Total intrinsic value of equity instruments other than options	$ 35	$ 598	$ 857