XML 89 R72.htm IDEA: XBRL DOCUMENT v3.6.0.2
STOCK PLANS (Textual) (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Apr. 23, 2015
Stock Plans        
Common shares available for future grant under all plans (in shares) 4,862,288      
Total stock-based compensation expense $ 10,332,000 $ 7,932,000 $ 8,416,000  
Tax benefit related to stock-based compensation recognized in the period 3,955,000 3,037,000 3,222,000  
Total unrecognized stock-based compensation expense related to nonvested stock options, restricted shares and restricted stock units $ 18,839,000      
Weighted average period of recognition of unrecognized stock-based compensation expense (in months) 2 years 4 months      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value $ 2,865,000 3,273,000 5,104,000  
Stock options        
Stock Plans        
Award expiration (in years) 10 years      
Award vesting period (in years) 3 years      
Aggregate intrinsic value of awards outstanding $ 40,803,000      
Aggregate intrinsic value of awards exercisable 34,666,000      
Total intrinsic value of awards exercised $ 30,967,000 $ 6,879,000 $ 14,647,000  
Restricted stock awards        
Stock Plans        
Shares converted (in shares) 11,940      
Shares granted 13,470      
Shares granted (in dollars per share) $ 79.43      
Remaining weighted average life of non-vested restricted awards (in years) 2 years      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 46,159 44,629    
Restricted Stock Units        
Stock Plans        
Shares converted (in shares) 25,891      
Shares granted 188,635      
Shares granted (in dollars per share) $ 58.33      
Remaining weighted average life of non-vested restricted awards (in years) 2 years 3 months 19 days      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 376,784 221,532    
Performance Shares [Member]        
Stock Plans        
Award vesting period (in years) 3 years      
Shares granted (in dollars per share) $ 58.14      
Remaining weighted average life of non-vested restricted awards (in years) 2 years 1 month 6 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) 15,827 16,012 5,511  
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
Equity and Incentive Compensation Plan [Member] | Restricted Stock Units        
Stock Plans        
Shares granted 142,165      
Equity and Incentive Compensation Plan [Member] | Performance Shares [Member]        
Stock Plans        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 46,470      
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) 17,132      
Deferred RSUs (in shares) 84,654      
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