STOCK OPTIONS AND STOCK AWARDS (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Stock option
Stock Option Information
Expiration period of shares granted	10 years
Vesting period	4 years
Interval period for vesting of granted awards	1 year
Stock options, Shares
Options outstanding at the beginning of the period (in shares)	6,626,176
Granted (in shares)	869,649
Exercised (in shares)	(1,250)
Forfeited (in shares)	(115,845)
Outstanding at the end of the period (in shares)	7,378,730
Exercisable at end of the period (in shares)	3,956,523
Stock options, Weighted average exercise price
Options outstanding at the beginning of the period (in dollars per share)	$ 22.50
Granted (in dollars per share)	$ 17.84
Exercised (in dollars per share)	$ 17.49
Forfeited (in dollars per share)	$ 24.67
Outstanding at the end of the period (in dollars per share)	$ 21.91
Exercisable at the end of the period (in dollars per share)	$ 23.45
Stock options, Weighted average remaining contractual life (in years)
Outstanding at end of the period	7 years 3 months 18 days
Exercisable at the end of the period	5 years 11 months 19 days
Stock options, Aggregate intrinsic value
Outstanding at the end of the period	$ 5,759
Exercisable at the end of the period	5,508
Additional disclosure
Stock closing price (in dollars per share)	$ 17.29
Total intrinsic value of options exercised	$ 2
Number of exercisable shares of common stock in-the-money	812,672
2004 Plan
Stock Option Information
Number of shares available for future grants	3,118,618