STOCK-BASED COMPENSATION PLANS - Summary of Activity of Stock Options (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Exercised	153,775	468,204	74,125
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at Beginning of Period	360,000	831,000	905,000
Granted
Exercised	(154,000)	(468,000)	(74,000)
Forfeited and cancelled		(3,000)
Outstanding at End of Period	206,000	360,000	831,000
Options exercisable at year end	206,000	161,000	430,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding at Beginning of Period	5.71	5.82	5.83
Granted
Exercised	5.54	5.91	5.99
Forfeited and cancelled		5.49
Outstanding at End of Period	5.83	5.71	5.82
Options exercisable at year end	5.83	5.98	6.13