SHARE-BASED COMPENSATION - RSUs with Market Conditions (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Restricted Stock Units With Market Conditions [Line Items]
RSUs issued	306,556	445,000	1,024,000
RSUs issued, Amount	$ 2,133	$ 4,721	$ 11,361
Reconciliation Of RSUs With Market Conditions [Abstract]
RSUs beginning	1,860,577
Number of RSUs granted	306,556	445,000	1,024,000
Number of RSUs forfeited	(26,484)	(28,000)	(85,000)
Number of RSUs vested	(659,381)	(886,000)	(527,000)
RSUs ending	1,481,268	1,860,577
Maximum
Share-based Compensation Restricted Stock Units With Market Conditions [Line Items]
Amortization period of grant in years			2 years
Minimum
Share-based Compensation Restricted Stock Units With Market Conditions [Line Items]
Amortization period of grant in years			1 year 7 months 6 days
Restricted Stock Units With Market Conditions [Member]
Share-based Compensation Restricted Stock Units With Market Conditions [Line Items]
RSUs issued	0	0	300
RSUs issued, Amount	$ 0	$ 0	$ 3,219
Reconciliation Of RSUs With Market Conditions [Abstract]
RSUs beginning	300	300	113
Number of RSUs granted	0	0	300
Number of RSUs forfeited	0	0	57
Number of RSUs vested	(100)	0	(56)
RSUs ending	200	300	300