STOCKHOLDERS' EQUITY, Stock Options (Details) (USD $)	6 Months Ended			3 Months Ended	6 Months Ended
	Jun. 30, 2012 Performance Based [Member]	Jun. 30, 2012 Market-Based Vesting [Member]	Jun. 30, 2011 Market-Based Vesting [Member]	Mar. 31, 2011 Stock Options [Member]	Jun. 30, 2012 Stock Options [Member] Y		Jun. 30, 2012 Employee Stock Option [Member]	Jun. 30, 2011 Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield (in hundredths)			0.00%				0.00%	0.00%
Risk-free interest rate (in hundredths)			4.11%				0.95%	2.21%
Expected volatility (in hundredths)			41.40%				52.83%	40.50%
Expected life (in years)			3.00				4.56	4.49
Stock Option Activity [Roll Forward]
Options outstanding at beginning of period (in shares)					5,367,145
Granted (in shares)	47,500	15,000			1,899,150	[1]
Exercised (in shares)					(1,121)
Forfeited or canceled (in shares)					(523,713)
Options outstanding at end of period (in shares)		1,653,655			6,741,461	[2]
Options vested at end of period or expected to vest (in shares)					5,848,614
Options exercisable at end of period (in shares)					2,148,832
Weighted-average exercise price, options outstanding at beginning of period (in dollars per share)					$ 20.01
Weighted-average exercise price, options granted (in dollars per share)					$ 11.29
Weighted-average exercise price, options exercised (in dollars per share)					$ 9.55
Weighted-average exercise price, options forfeited or canceled (in dollars per share)					$ 18.00
Weighted-average exercise price, options outstanding at end of period (in dollars per share)					$ 17.71
Weighted-average exercise price, options vested at March 31, 2012 or expected to vest (in dollars per share)					$ 17.77
Weighted-average exercise price, options exercisable at March 31, 2012 (in dollars per share)					$ 20.78
Weighted-average remaining contractual term of options outstanding (in years)					4.58
Weighted-average remaining contractual term of options vested or expected to vest (in years)					4.55
Weighted-average remaining contractual term of options exercisable (in years)					3.58
Aggregate intrinsic value options outstanding					$ 5,918,000
Aggregate intrinsic value options vested or expected to vest					5,726,000
Aggregate intrinsic value options exercisable					178,000
Aggregate intrinsic value of stock options exercised				1,100,000
Cash received from the exercise of stock options				$ 1,900,000
Weighted-average fair value of options granted (per share)							$ 4.97	$ 7.89

[1] Options granted during the six months ended June 30, 2012 included 47,500 options that had vesting based on performance conditions and 15,000 options that had vesting based on either market conditions or a combination of performance or market conditions.

[2] Options outstanding at June 30, 2012 included 1,653,655 options that had vesting based on either performance conditions, market conditions or a combination of performance or market conditions.