STOCKHOLDERS' EQUITY AND SHARE-BASED COMPENSATION EXPENSE, Restricted Stock Awards (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Weighted Average Grant Date Fair Value [Roll Forward]
Restricted stock awards vested, Fair value	$ 16,216	$ 14,644
Restricted Stock Awards (RSAs) [Member]
Number of Shares [Roll Forward]
Non-vested stock outstanding at beginning of the period (in shares)	540
Granted (in shares)	0
Vested (in shares)	(310)
Forfeited (in shares)	(63)
Non-vested stock outstanding at end of the period (in shares)	167
Weighted Average Grant Date Fair Value [Roll Forward]
Non-vested stock outstanding at the beginning of the period (in dollars per share)	$ 7.32
Granted (in dollars per share)	$ 0
Vested (in dollars per share)	$ 8.22
Forfeited (in dollars per share)	$ 6.64
Non-vested stock outstanding at end of the period (in dollars per share)	$ 5.89
Restricted Stock Units (RSUs) [Member]
Number of Shares [Roll Forward]
Non-vested stock outstanding at beginning of the period (in shares)	2,057
Granted (in shares)	1,451
Vested (in shares)	(515)
Forfeited (in shares)	(302)
Non-vested stock outstanding at end of the period (in shares)	2,691
Weighted Average Grant Date Fair Value [Roll Forward]
Non-vested stock outstanding at the beginning of the period (in dollars per share)	$ 4.74
Granted (in dollars per share)	$ 4.09
Vested (in dollars per share)	$ 5.20
Forfeited (in dollars per share)	$ 4.69
Non-vested stock outstanding at end of the period (in dollars per share)	$ 4.31