XML 99 R83.htm IDEA: XBRL DOCUMENT v3.6.0.2
Stock-Based Compensation Plans 2 (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Number of Options      
Exercised (in shares) (12,546) (66,458) (37,006)
Options outstanding at the end of the period (in shares) 136,560    
Additional disclosure      
Cash proceeds from the exercise of stock options $ 235,000 $ 1,198,000 $ 589,000
Tax benefit for the tax deduction from awards exercised (581,000) $ (877,000) $ (533,000)
Unrecognized compensation cost $ 879,000    
Maximum [Member]      
Additional disclosure      
Percentage of target amount of performance shares 200.00%    
Minimum      
Additional disclosure      
Percentage of target amount of performance shares 0.00%    
Weighted Average [Member]      
Additional disclosure      
Expected recognition period for unrecognized compensation cost 1 year 6 months 10 days    
Stock options      
Number of Options      
Options Outstanding at the beginning of the period (in shares) 150,606    
Granted (in shares) 0 0 0
Exercised (in shares) (12,546)    
Forfeited or expired (in shares) (1,500)    
Options outstanding at the end of the period (in shares) 136,560 150,606  
Options exercisable at the end of the period (in shares) 136,560    
Weighted Average Exercise Price      
Options outstanding at the beginning of the period (in dollars per share) $ 17.39    
Granted (in dollars per share) 0.00    
Exercised (in dollars per share) 18.75    
Forfeited or expired (in dollars per share) 16.87    
Options outstanding at the end of the period (in dollars per share) 17.27 $ 17.39  
Options exercisable at the end of the period (in dollars per share) $ 17.27    
Additional disclosure      
Weighted Average Remaining Contractual Term, Options outstanding 1 year 11 months 3 days    
Weighted Average Remaining Contractual Term, Options Exercisable 1 year 11 months 3 days    
Aggregate Intrinsic Value, Options outstanding $ 3,863,731    
Aggregate Intrinsic Value, Options Exercisable 3,863,731    
Total intrinsic value of options exercised 308,000 $ 1,457,000 $ 596,000
Tax benefit for the tax deduction from awards exercised   $ (877,000) (533,000)
Restricted Stock Units      
Additional disclosure      
Unrecognized compensation cost related to performance awards $ 800,000    
Number of Restricted/Performance Share Units      
Restricted share units at the beginning of the period (in shares) 111,335    
Granted (in shares) 37,807    
Vested (in shares) (40,555)    
Forfeited (in shares) (858)    
Restricted share units at the end of the period (in shares) 107,729 111,335  
Weighted Average Grant-Date Value      
Restricted share units at the beginning of the period (in dollars per share) $ 26.21    
Granted (in dollars per share) 40.52    
Vested (in dollars per share) 27.03    
Forfeited (in dollars per share) 38.06    
Restricted share units at the end of the period (in dollars per share) $ 30.83 $ 26.21  
Restricted Stock Units | Weighted Average [Member]      
Additional disclosure      
Expected recognition period for unrecognized compensation cost 1 year 5 months 2 days    
Performance awards      
Additional disclosure      
Vesting period 3 years    
Period to meet the performance goals 3 years    
Number of Restricted/Performance Share Units      
Restricted share units at the beginning of the period (in shares) 131,953    
Granted (in shares) 29,758    
Vested (in shares) (51,408)    
Restricted share units at the end of the period (in shares) 102,203 131,953  
Weighted Average Grant-Date Value      
Restricted share units at the beginning of the period (in dollars per share) $ 30.66    
Granted (in dollars per share) 40.81    
Vested (in dollars per share) 27.82    
Restricted share units at the end of the period (in dollars per share) $ 35.25 $ 30.66  
GSWC      
Additional disclosure      
Tax benefit for the tax deduction from awards exercised $ (501,000) $ (872,000) (514,000)
GSWC | Stock options      
Additional disclosure      
Tax benefit for the tax deduction from awards exercised $ (501,000) $ (872,000) $ (514,000)