STOCKHOLDERS' EQUITY AND SHARE-BASED COMPENSATION EXPENSE, Stock Options (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012
Fair value of options estimated at the date of grant with weighted average assumptions [Abstract]
Risk free interest rate (in hundredths)	0.60%	1.50%	1.10%
Expected dividend yield (in hundredths)	0.00%	0.00%	0.00%
Expected volatility (in hundredths)	67.00%	67.00%	76.00%
Expected option term (in years)	4 years 7 months 6 days	4 years 6 months	4 years 1 month 6 days
Term of historical trend	10 years
Weighted average grant date fair value of options granted (in dollars per share)	$ 2.14	$ 2.86	$ 2.66
Options, Outstanding [Roll Forward]
Outstanding at beginning of the period (in shares)	6,276
Grants (in shares)	1,159
Exercises (in shares)	(109)
Forfeitures or expirations (in shares)	(1,225)
Outstanding at end of the period (in shares)	6,101	6,276
Exercisable (in shares)	3,175
Vested and expected to vest (in shares)	5,616
Weighted Average Exercise Price Per Share [Roll Forward]
Outstanding at beginning of the period (in dollars per share)	$ 9.41
Grants (in dollars per share)	$ 4.03
Exercises (in dollars per share)	$ 3.51
Forfeitures or expirations (in dollars per share)	$ 13.08
Outstanding at end of the period (in dollars per share)	$ 7.75	$ 9.41
Exercisable (in dollars per share)	$ 10.52
Vested and expected to vest (in dollars per share)	$ 8.03
Weighted-Average Remaining Contractual Terms [Abstract]
Outstanding at end of the period	4 years 5 months 12 days
Exercisable	3 years 3 months 18 days
Vested and expected to vest	4 years 3 months 7 days
Aggregate Intrinsic Value [Abstract]
Outstanding at end of the period	$ 85,529
Exercisable	70,079
Vested and expected to vest	85,444
Options outstanding and exercisable [Abstract]
Number of Options Outstanding (in shares)	6,101
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	4 years 5 months 1 day
Option Outstanding, Weighted-Average Exercise Price Per Share (in dollars per share)	$ 7.75
Number of Option Exercisable (in shares)	3,175
Option Exercisable, Weighted-Average Exercise Price Per Share (in dollars per share)				$ 10.52
Total intrinsic value of options exercised	$ 115	$ 399	$ 249
Reserved Shares [Abstract]
Options outstanding (in shares)	6,101	6,276
Options available for future grants (in shares)	5,262
Common stock reserved for convertible subordinated notes (in shares)	17,985
Total shares reserved (in shares)	29,348
Range $ 2.63 - 3.22 [Member]
Options outstanding and exercisable [Abstract]
Range Exercise Price , Lower Range Limit (in dollars per share)	$ 2.63
Range of Exercise Price, Upper Range Limit (in dollars per share)	$ 3.22
Number of Options Outstanding (in shares)	393
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	3 years 6 months 25 days
Option Outstanding, Weighted-Average Exercise Price Per Share (in dollars per share)	$ 2.95
Number of Option Exercisable (in shares)	253
Option Exercisable, Weighted-Average Exercise Price Per Share (in dollars per share)				$ 2.89
Range $ 3.32 - 4.16 [Member]
Options outstanding and exercisable [Abstract]
Range Exercise Price , Lower Range Limit (in dollars per share)	$ 3.32
Range of Exercise Price, Upper Range Limit (in dollars per share)	$ 4.16
Number of Options Outstanding (in shares)	954
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	6 years 5 months 8 days
Option Outstanding, Weighted-Average Exercise Price Per Share (in dollars per share)	$ 3.92
Number of Option Exercisable (in shares)	54
Option Exercisable, Weighted-Average Exercise Price Per Share (in dollars per share)				$ 3.85
Range $ 4.21 - 4.22 [Member]
Options outstanding and exercisable [Abstract]
Range Exercise Price , Lower Range Limit (in dollars per share)	$ 4.21
Range of Exercise Price, Upper Range Limit (in dollars per share)	$ 4.22
Number of Options Outstanding (in shares)	848
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	4 years 7 months 20 days
Option Outstanding, Weighted-Average Exercise Price Per Share (in dollars per share)	$ 4.22
Number of Option Exercisable (in shares)	409
Option Exercisable, Weighted-Average Exercise Price Per Share (in dollars per share)				$ 4.22
Range $ 4.26 - 4.85 [Member]
Options outstanding and exercisable [Abstract]
Range Exercise Price , Lower Range Limit (in dollars per share)	$ 4.26
Range of Exercise Price, Upper Range Limit (in dollars per share)	$ 4.85
Number of Options Outstanding (in shares)	797
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	5 years 7 months 28 days
Option Outstanding, Weighted-Average Exercise Price Per Share (in dollars per share)	$ 4.73
Number of Option Exercisable (in shares)	202
Option Exercisable, Weighted-Average Exercise Price Per Share (in dollars per share)				$ 4.75
Range $ 4.88 - 5.74 [Member]
Options outstanding and exercisable [Abstract]
Range Exercise Price , Lower Range Limit (in dollars per share)	$ 4.88
Range of Exercise Price, Upper Range Limit (in dollars per share)	$ 5.74
Number of Options Outstanding (in shares)	803
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	4 years 8 months 23 days
Option Outstanding, Weighted-Average Exercise Price Per Share (in dollars per share)	$ 5.37
Number of Option Exercisable (in shares)	362
Option Exercisable, Weighted-Average Exercise Price Per Share (in dollars per share)				$ 5.41
Range $ 5.78 - 8.29 [Member]
Options outstanding and exercisable [Abstract]
Range Exercise Price , Lower Range Limit (in dollars per share)	$ 5.78
Range of Exercise Price, Upper Range Limit (in dollars per share)	$ 8.29
Number of Options Outstanding (in shares)	1,027
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	4 years 5 months 19 days
Option Outstanding, Weighted-Average Exercise Price Per Share (in dollars per share)	$ 7.33
Number of Option Exercisable (in shares)	616
Option Exercisable, Weighted-Average Exercise Price Per Share (in dollars per share)				$ 7.45
Range $ 8.71 - 19.92 [Member]
Options outstanding and exercisable [Abstract]
Range Exercise Price , Lower Range Limit (in dollars per share)	$ 8.71
Range of Exercise Price, Upper Range Limit (in dollars per share)	$ 19.92
Number of Options Outstanding (in shares)	822
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	2 years 4 months 13 days
Option Outstanding, Weighted-Average Exercise Price Per Share (in dollars per share)	$ 12.52
Number of Option Exercisable (in shares)	822
Option Exercisable, Weighted-Average Exercise Price Per Share (in dollars per share)				$ 12.52
Range $ 20.90 - 57.08 [Member]
Options outstanding and exercisable [Abstract]
Range Exercise Price , Lower Range Limit (in dollars per share)	$ 20.90
Range of Exercise Price, Upper Range Limit (in dollars per share)	$ 57.08
Number of Options Outstanding (in shares)	457
Options Outstanding, Weighted-Average Remaining Contractual Life (in years)	1 year 3 months 25 days
Option Outstanding, Weighted-Average Exercise Price Per Share (in dollars per share)	$ 28.29
Number of Option Exercisable (in shares)	457
Option Exercisable, Weighted-Average Exercise Price Per Share (in dollars per share)				$ 28.29