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STOCK PLANS (Textual) (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Apr. 23, 2015
Stock Plans        
Common shares available for future grant under all plans (in shares) 5,600,763      
Total stock-based compensation expense $ 7,932,000 $ 8,416,000 $ 9,734,000  
Tax benefit related to stock-based compensation recognized in the period 3,037,000 3,222,000 3,727,000  
Total unrecognized stock-based compensation expense related to nonvested stock options, restricted shares and restricted stock units $ 15,371,000      
Weighted average period of recognition of unrecognized stock-based compensation expense (in months) 2 years 11 months      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value $ 3,273,000 5,104,000 5,131,000  
Stock options        
Stock Plans        
Award expiration (in years) 10 years      
Award vesting period (in years) 3 years      
Aggregate intrinsic value of awards outstanding $ 30,121,000      
Aggregate intrinsic value of awards exercisable 30,121,000      
Total intrinsic value of awards exercised $ 6,879,000 $ 14,647,000 $ 26,288,000  
Restricted stock awards        
Stock Plans        
Shares converted (in shares) 20,745 80,753 224,021  
Shares granted 20,476 14,927 14,464  
Shares granted (in dollars per share) $ 53.94 $ 66.32 $ 70.88  
Remaining weighted average life of non-vested restricted awards (in years) 2 years 1 month 6 days      
Restricted Stock Units        
Stock Plans        
Shares converted (in shares) 76,996 40,035 33,698  
Shares granted 67,800 2,861 69,925  
Shares granted (in dollars per share) $ 68.82 $ 70.71 $ 67.17  
Remaining weighted average life of non-vested restricted awards (in years) 3 years 2 months 12 days      
1995 Lincoln Stock Purchase Plan        
Stock Plans        
Maximum additional number of the Company's common shares that may be granted (in shares) 800,000      
Shares purchased (in shares) 16,012 5,511 4,653  
Equity and Incentive Compensation Plan [Member]        
Stock Plans        
Maximum additional number of the Company's common shares that may be granted (in shares)       5,400,000
Director Plan        
Stock Plans        
Maximum additional number of the Company's common shares that may be granted (in shares)       300,000
2005 Plan | Restricted Stock Units        
Stock Plans        
Shares converted (in shares) 18,022      
Deferred RSUs (in shares) 66,024      
Minimum | Restricted stock awards        
Stock Plans        
Award vesting period (in years) 3 years      
Minimum | Restricted Stock Units        
Stock Plans        
Award vesting period (in years) 3 years      
Maximum | Restricted stock awards        
Stock Plans        
Award vesting period (in years) 5 years      
Maximum | Restricted Stock Units        
Stock Plans        
Award vesting period (in years) 5 years      
Maximum | 1995 Lincoln Stock Purchase Plan        
Stock Plans        
Dollar value of shares that each employee has the ability to purchase on the open market, on a commission-free basis annually under the plan $ 10,000