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STOCK BASED COMPENSATION PLANS (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of compensation plans 2    
Shares available for grant under 2004 LTIP Plan (in shares) 840,854    
Weighted-Average Exercise Price [Roll Forward]      
Intrinsic value of exercised options and stock-settled appreciation rights $ 760,000 $ 49,000 $ 1,172,000
Total compensation cost related to unvested equity awards 4,110,000    
Weighted-average period of recognition of cost 2 years 6 months    
Restricted Stock Award [Member]
      
Shares or Units and Rights [Roll Forward]      
Outstanding, beginning balance (in shares) 432,025 289,125 292,175
Granted (in shares) 252,700 249,600 201,400
Exercised or restrictions lapsed (in shares) (127,050) [1] (104,000) [1] (195,325) [1]
Forfeited or expired (in shares) (1,750) (2,700) (9,125)
Outstanding, ending balance (in shares) 555,925 432,025 289,125
Weighted-Average Award Price [Roll Forward]      
Outstanding, beginning balance (in dollars per share) $ 12.13 $ 11.65 $ 10.37
Granted (in dollars per share) $ 12.34 $ 12.67 $ 12.07
Exercised or restrictions lapsed (in dollars per share) $ 11.87 [1] $ 12.03 [1] $ 10.28 [1]
Forfeited or expired (options) (in dollars per share) $ 12.34 $ 12.39 $ 10.97
Outstanding, ending balance (in dollars per share) $ 12.28 $ 12.13 $ 11.65
Weighted-Average Exercise Price [Roll Forward]      
Aggregate intrinsic value of outstanding awards 9,067,000    
Fair value of vested restricted common stock 1,528,000 1,251,000 3,099,000
Period of restrictions over awards 4 years    
Compensation expense 2,553,000 2,060,000 1,716,000
Stock-Settled Appreciation Rights [Member]
      
Shares or Units and Rights [Roll Forward]      
Outstanding, beginning balance (in shares) 144,049 144,049 152,100
Granted (in shares) 0 0 0
Exercised or restrictions lapsed (in shares) (22,300) [1] 0 [1] (8,051) [1]
Forfeited or expired (in shares)   0 0
Outstanding, ending balance (in shares) 121,749 144,049 144,049
Exercisable, ending balance (in shares) 96,224 80,508 42,480
Weighted-Average Award Price [Roll Forward]      
Outstanding, beginning balance (in dollars per share) $ 8.87 $ 8.87 $ 8.87
Granted (in dollars per share) $ 0 $ 0 $ 0
Exercised or restrictions lapsed (in dollars per share) $ 8.94 [1] $ 0 [1] $ 8.92 [1]
Forfeited or expired (options) (in dollars per share)   $ 0 $ 0
Outstanding, ending balance (in dollars per share) $ 8.85 $ 8.87 $ 8.87
Exercisable, ending balance (in dollars per share) $ 8.89 $ 8.91 $ 8.95
Weighted-Average Exercise Price [Roll Forward]      
Aggregate intrinsic value of vested awards 714,000    
Aggregate intrinsic value of outstanding awards $ 908,000    
Options [Member]
      
Shares [Roll Forward]      
Outstanding, beginning balance (in shares) 292,100 830,427 1,505,025
Granted (in shares) 0 0 0
Exercised or restrictions lapsed (in shares) (236,100) [1] (25,000) [1] (272,162) [1]
Forfeited or expired (options) (in shares) (6,000) (513,327) (402,436)
Outstanding, ending balance (in shares) 50,000 292,100 830,427
Exercisable, ending balance (in share) 50,000 292,100 830,427
Weighted-Average Exercise Price [Roll Forward]      
Outstanding, beginning balance (in dollars per share) $ 14.20 $ 15.18 $ 15.62
Granted (in dollars per share) $ 0 $ 0 $ 0
Exercised or restrictions lapsed (in dollars per share) $ 12.89 [1] $ 10.81 [1] $ 12.20 [1]
Forfeited or expired (options) (in dollars per share) $ 12.84 $ 15.95 $ 18.84
Outstanding, ending balance (in dollars per share) $ 20.56 $ 14.20 $ 15.18
Exercisable, ending balance (in dollars per share) $ 20.56 $ 14.20 $ 15.18
Options outstanding expiring 2013, Weighted average exercise price (in dollars per share) $ 20.75    
[1] The total intrinsic value of options and stock-settled appreciation rights exercised was approximately $760,000, $49,000 and $1,172,000 in 2012, 2011 and 2010, respectively.