STOCK-BASED COMPENSATION (Details 2) (Stock Options, USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Summary of stock option activity
Outstanding at beginning of period (in shares)	677,708
Exercised (in shares)	(23,584)
Expired (in shares)	(141,291)
Outstanding at end of period (in shares)	512,833
Vested or expected to vest at end of period (in shares)	512,833
Exercisable at end of period (in shares)	512,833
Outstanding at beginning of period, weighted average exercise price (in dollars per share)	$ 28.41
Exercised, weighted average exercise price (in dollars per share)	$ 18.73
Expired, weighted average exercise price (in dollars per share)	$ 36.90
Outstanding at end of period, weighted average exercise price (in dollars per share)	$ 26.52
Vested or expected to vest at end of period, weighted average exercise price (in dollars per share)	$ 26.52
Exercisable at end of period, weighted average exercise price (in dollars per share)	$ 26.52
Outstanding at end of period, weighted average remaining term	1 year 6 months 22 days
Vested or expected to vest at end of period, weighted average remaining term	1 year 6 months 22 days
Exercisable at end of period, weighted average remaining term	1 year 6 months 22 days
Outstanding at end of period, aggregate intrinsic value	$ 1,786
Vested or expected to vest at end of period, aggregate intrinsic value	1,786
Exercisable at end of period, aggregate intrinsic value	1,786
Summary of unvested stock option activity
Unvested options at beginning of period, weighted average grant date fair value (in shares)	14,502
Vested, weighted average grant date fair value (in shares)	(14,502)
Unvested options at beginning of period (in dollars per share)	$ 3.00
Vested (in dollars per share)	$ 3.00
Share based compensation plan, additional disclosures
Total intrinsic value of options exercised	127	575
Total fair value of options vested	$ 363	$ 3,001
Minimum
Stock Options
Vesting period	3 years
Contractual term of stock option grants	7 years
Maximum
Stock Options
Vesting period	4 years
Contractual term of stock option grants	10 years