STOCK INCENTIVE AND STOCK OPTION PLANS (Details) (USD $)	12 Months Ended										1 Months Ended	12 Months Ended			1 Months Ended				12 Months Ended			1 Months Ended		12 Months Ended
	Dec. 31, 2011	Dec. 31, 2011 Range 1 of Exercise Prices [Member]	Dec. 31, 2011 Range 2 of Exercise Prices [Member]	Dec. 31, 2011 Range 3 of Exercise Prices [Member]	Dec. 31, 2011 Range 4 of Exercise Prices [Member]	Dec. 31, 2011 Range 5 of Exercise Prices [Member]	Dec. 31, 2011 1998 Plan [Member]	Dec. 31, 2011 Stock Options [Member] Y	Dec. 31, 2010 Stock Options [Member] Y	Dec. 31, 2009 Stock Options [Member]	Dec. 31, 2010 Stock Options [Member] 1994 Plan [Member] Y	Dec. 31, 2011 Nonvested Options [Member]	Dec. 31, 2010 Nonvested Options [Member]	Dec. 31, 2009 Nonvested Options [Member]	Mar. 31, 2011 Performance Shares [Member] 1994 Plan [Member]	Jan. 31, 2010 Performance Shares [Member] 1994 Plan [Member]	Jan. 31, 2009 Performance Shares [Member] 1994 Plan [Member]	Jan. 31, 2008 Performance Shares [Member] 1994 Plan [Member]	Dec. 31, 2011 Performance Shares [Member] 1994 Plan [Member]	Dec. 31, 2010 Performance Shares [Member] 1994 Plan [Member]	Dec. 31, 2009 Performance Shares [Member] 1994 Plan [Member]	May 31, 2010 Restricted Stock Units [Member]	May 31, 2009 Restricted Stock Units [Member]	Dec. 31, 2011 Restricted Stock Units [Member]	Dec. 31, 2010 Restricted Stock Units [Member]	Dec. 31, 2009 Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercisable period of options, minimum (in years)	1Y
Exercisable period of options, maximum (in years)	10Y
Minimum percentage of each director's compensation paid in form of the Company's common stock (in hundredths)							50.00%
Compensation expense recognized (reversed)								$ 2,100,000	$ 2,100,000	$ 1,700,000									$ 147,000	$ (461,000)	$ 461,000			$ 37,000	$ 112,000	$ 117,000
Total unrecognized compensation cost related to nonvested stock options									1,700,000
Weighted-average period for recognition of unrecognized expenses (in years)									3
Stock option activity [Roll Forward]
Outstanding at begining of period (in shares)								2,946,307	2,701,693
Nonvested, outstanding at beginning of period (in shares)												794,311
Granted (in shares)									408,363		408,363
Exercised (in shares)								(2,225)	(22,336)
Vested (in shares)												(388,383)
Cancelled or forfeited (in shares)								(76,659)	(46,213)			(22,139)
Expired (in shares)								(153,400)	(95,200)
Outstanding at end of period (in shares)								2,714,023	2,946,307	2,701,693
Nonvested, outstanding at end of period (in shares)												383,789	794,311
Exercisable at end of period (in shares)								2,330,234	2,151,996
Stock options, additional disclosures [Abstract]
Outstanding at beginning of period, Weighted-average exercise price (in dollars per share)								$ 21.41	$ 22.33			$ 17.96
Granted, Weighted-average exercise price (in dollars per share)									$ 13.25
Vested, Weighted-average exercise price (in dollars per share)												$ 19.46
Exercised, Weighted-average exercise price (in dollars per share)								$ 9.40	$ 15.01
Cancelled or forfeited, Weighted-average exercise price (in dollars per share)								$ 22.86	$ 23.28			$ 22.31
Expired, Weighted-average exercise price (in dollars per share)								$ 15.39	$ 13.21
Outstanding at end of period, Weighted-average exercise price (in dollars per share)								$ 21.72	$ 21.41	$ 22.33		$ 16.20	$ 17.96
Exercisable at end of period, Weighted-average exercise price (in dollars per share)								$ 22.63	$ 22.68
Outstanding at end of period, Weighted-average remaining contractual term (in years)								3.6	4.4		7
Exercisable at end of period, Weighted-average remaining contractual term (in years)								3.3	3.7
Outstanding at end of period, Weighted-average intrinsic value								2,000	1,219,000
Exercisable at end of period, Weighted-average intrinsic value								2,000	116,000
Non-vested options, Weighted-Average grant date fair value [Roll Forward]
Outstanding at beginning of period, Weighted-average grant date fair value (in dollars per share)												$ 5.25
Granted, Weighted-average grant date fair value (in dollars per share)													$ 4.00	$ 6.70
Vested, Weighted-average grant date fair value (in dollars per share)												$ 5.55
Forfeited or cancelled, Weighted-average grant date fair value (in dollars per share)												$ 6.42
Outstanding at end of period, Weighted-average grant date fair value (in dollars per share)												$ 4.87	$ 5.25
Additional general disclosures [Abstract]
Vesting period, description											one, two or three-year service period
Vesting period (in years)															3Y	3Y	3Y	3Y
Assumptions used for stock options [Abstract]
Expected volatility (in hundredths)									45.20%	43.60%
Weighted-average volatility (in hundredths)									45.20%	43.60%
Expected dividends (in hundredths)									3.75%	3.75%
Expected term, minimum (in years)									4.8	5.1
Expected term, maximum (in years)									6.0	5.7
Risk-free rate (in hundredths)									1.64%	2.33%
Intrinsic value of stock options exercised									$ 143,000	$ 1,600,000
Equity instruments other than options [Abstract]
Number of awards granted (in shares)															125,410	125,395	101,225	85,395				5,000	5,000	0
Terms of award															two-year performance period from January 1, 2011 through December 31, 2012	two-year performance period from January 1, 2010 through December 31, 2011	two-year performance period from January 1, 2009 through December 31, 2010	two-year performance period from January 1, 2008 through December 31, 2009
Shares of stock covered by award (in shares)																						5,000	5,000	0
Stock options outstanding [Abstract]
Range of Exercise Prices, lower limit (in dollars per share)		$ 9.97	$ 17.10	$ 21.41	$ 24.03	$ 9.97
Range of Exercise Prices, upper limit (in dollars per share)		$ 13.25	$ 20.23	$ 23.51	$ 25.31	$ 25.31
Number Outstanding (in shares)		409,356	150,688	1,313,363	840,616	2,714,023
Options Outstanding, Weighted Average Remaining Life (in years)		5.9	1.3	3.4	3.1	3.6
Options Outstanding, Weighted Average Exercise Price (in dollars per share)		$ 13.23	$ 19.59	$ 22.89	$ 24.39	$ 21.72
Number Exercisable (in shares)		149,258	150,688	1,189,672	840,616	2,330,234
Options Exercisable, Weighted Average Exercise Price (in dollars per share)		$ 13.21	$ 19.59	$ 22.94	$ 24.40	$ 22.63