XML 29 R73.htm IDEA: XBRL DOCUMENT v2.4.0.8
Stock-Based Compensation Plans (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Assumptions used to estimate fair value of each option grant on the grant date using the Black-Scholes option-pricing model      
Weighted-average fair value of option granted (in dollars per share)     $ 7.15
Risk-free interest rate (as a percent)     2.48%
Expected annual dividend yield (as a percent)     3.04%
Expected volatility factor (as a percent)     28.98%
Expected option term (in years)     5 years
Number of Options      
Exercised (in shares) (131,448) (819,400) (177,426)
Options outstanding at the end of the period (in shares) 264,596    
Additional disclosure      
Cash proceeds from the exercise of stock options $ 2,111,000 $ 13,295,000 $ 2,350,000
Tax benefit for the tax deduction from awards exercised 1,026,000 890,000 336,000
Unrecognized compensation cost 493,000    
Percentage of performance award earned based on total shareholder return 25.00%    
Percentage of performance award earned based on GSWC's operating expense 75.00%    
Maximum
      
Additional disclosure      
Expected recognition period for unrecognized compensation cost 2 years 2 months    
Percentage of target amount of performance shares 200.00%    
Minimum
      
Additional disclosure      
Expected recognition period for unrecognized compensation cost 1 year 1 month    
Percentage of target amount of performance shares 0.00%    
Stock options
      
Number of Options      
Options Outstanding at the beginning of the period (in shares) 403,158    
Granted (in shares) 0    
Exercised (in shares) (131,448)    
Forfeited or expired (in shares) (7,114)    
Options outstanding at the end of the period (in shares) 264,596 403,158  
Options exercisable at the end of the period (in shares) 264,545    
Weighted Average Exercise Price      
Options outstanding at the beginning of the period (in dollars per share) $ 16.72    
Granted (in dollars per share) $ 0.00    
Exercised (in dollars per share) $ 16.06    
Forfeited or expired (in dollars per share) $ 13.13    
Options outstanding at the end of the period (in dollars per share) $ 17.16 $ 16.72  
Options exercisable at the end of the period (in dollars per share) $ 17.16    
Additional disclosure      
Weighted Average Remaining Contractual Term, Options outstanding 3 years 9 months    
Weighted Average Remaining Contractual Term, Options Exercisable 3 years 9 months    
Aggregate Intrinsic Value, Options outstanding 3,060,764    
Aggregate Intrinsic Value, Options Exercisable 3,060,166    
Total intrinsic value of options exercised 1,402,000 4,125,000 766,000
Tax benefit for the tax deduction from awards exercised 1,026,000 890,000 336,000
Restricted Stock Units
      
Additional disclosure      
Unrecognized compensation cost related to performance awards $ 825,000    
Number of Restricted/Performance Share Units      
Restricted share units at the beginning of the period (in shares) 287,510    
Granted (in shares) 61,312    
Vested (in shares) (148,522)    
Forfeited (in shares) (3,264)    
Restricted share units at the end of the period (in shares) 197,036    
Weighted Average Grant-Date Value      
Restricted share units at the beginning of the period (in dollars per share) $ 16.97    
Granted (in dollars per share) $ 26.14    
Vested (in dollars per share) $ 17.93    
Forfeited (in dollars per share) $ 20.78    
Restricted share units at the end of the period (in dollars per share) $ 19.04    
Restricted Stock Units | Maximum
      
Additional disclosure      
Expected recognition period for unrecognized compensation cost 2 years 9 months 27 days    
Restricted Stock Units | Minimum
      
Additional disclosure      
Expected recognition period for unrecognized compensation cost 29 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) 11,822    
Granted (in shares) 33,024    
Vested (in shares) (3,926)    
Restricted share units at the end of the period (in shares) 40,920    
Weighted Average Grant-Date Value      
Restricted share units at the beginning of the period (in dollars per share) $ 18.37    
Granted (in dollars per share) $ 27.37    
Vested (in dollars per share) $ 18.42    
Restricted share units at the end of the period (in dollars per share) $ 25.63