STOCK PLANS (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Stock options	Dec. 31, 2011 Stock options	Dec. 31, 2010 Stock options	Dec. 31, 2012 Stock options Key employees	Dec. 31, 2009 Stock options Key employees	Dec. 31, 2012 Restricted stock	Dec. 31, 2011 Restricted stock	Dec. 31, 2008 Restricted stock Key employees	Dec. 31, 2012 Restricted Stock Units	Dec. 31, 2012 Restricted Stock Units Key employees
Number of Restricted Shares Granted
Outstanding at beginning of year (in shares)									1,386,552
Granted (in shares)									315,030	762,004	992,117	110,000	110,000
Forfeited (in shares)									(10,166)
Vested (in shares)									(625,427)
Outstanding at end of year (in shares)									1,386,552	1,386,552
Weighted Average Fair Value
Outstanding at beginning of year (in dollars per share)									$ 18.69
Granted (in dollars per share)	$ 15.98								$ 15.98			$ 14.04
Forfeited (in dollars per share)									$ 18.91
Vested (in dollars per share)									$ 18.89
Outstanding at end of year (in dollars per share)									$ 17.77	$ 18.69
Number of Options
Outstanding at beginning of year (in shares)				1,540,193	2,505,101	3,407,761
Granted (in shares)				20,000			20,000	935,000
Exercised (in shares)	(93,839)	(878,658)	(790,596)	(93,839)	(878,658)	(790,596)
Expired (in shares)				(37,070)
Forfeited (in shares)				(65,000)	(86,250)	(112,064)
Outstanding at end of year (in shares)				1,364,284	1,540,193	2,505,101
Exercisable at end of year (in shares)				1,120,284	1,062,193	1,683,101
Weighted Average Exercise Price
Outstanding at beginning of year (in dollars per share)				$ 13.83	$ 14.22	$ 13.75
Exercised (in dollars per share)				$ 11.09	$ 14.97	$ 12.20
Granted (in dollars per share)				$ 15.98
Expired (in dollars per share)				$ 16.34
Forfeited (in dollars per share)				$ 16.76	$ 13.54	$ 14.20
Outstanding at end of year (in dollars per share)				$ 13.84	$ 13.83	$ 14.22
Exercisable at end of year (in dollars per share)				$ 14.46	$ 15.28	$ 15.67
Weighted Average Remaining Contractual Term
Outstanding at end of year				3 years 6 months 11 days	4 years 4 months 6 days	4 years 5 months 19 days
Exercisable at end of year				3 years 4 months 2 days	4 years 22 days	3 years 8 months 19 days
Aggregate Intrinsic Value
Outstanding at beginning of year				$ 3,631,381	$ 7,742,565
Exercised				426,278	4,731,919	905,051
Expired				37,070
Forfeited				76,425	565,800	35,192
Outstanding at end of year				3,686,098	3,631,381	7,742,565
Exercisable at end of year				$ 2,608,058	$ 1,597,081	$ 2,961,443
Vesting period				5 years			5 years	4 years
Contractual life							10 years	7 years
Weighted-average grant-date fair value of options granted (in dollars per share)				$ 6.26			$ 6.26