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CONSOLIDATED STATEMENTS OF CHANGES IN COMMON SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
GSWC
Common Stock [Member]
Common Stock [Member]
GSWC
Earnings Reinvested in the Business
Earnings Reinvested in the Business
GSWC
Balances at Dec. 31, 2015 $ 465,945 $ 423,730 $ 245,022 $ 238,795 $ 220,923 $ 184,935
Balances (in shares) at Dec. 31, 2015     36,502,000 146    
Balances (in shares) at Dec. 31, 2016     36,571,000 146    
Add:            
Net Income 59,743 46,969     59,743 46,969
Exercise of stock options and other issuance of Common Shares $ 235   $ 235      
Issuance of Common Shares (in shares) 56,900   69,000      
Tax benefit from employee stock-based awards $ 581 501 $ 581 $ 501    
Compensation on stock-based awards 1,201 1,020 1,201 1,020    
Dividend equivalent rights on stock-based awards not paid in cash 193 166 193 166    
Deduct:            
Dividends on Common Shares 33,408 25,450     33,408 25,450
Dividend equivalent rights on stock-based awards 193 166     193 166
Balances at Dec. 31, 2016 494,297 446,770 $ 247,232 $ 240,482 247,065 206,288
Balances (in shares) at Dec. 31, 2017     36,681,000 146    
Add:            
Net Income 69,367 53,757     69,367 53,757
Exercise of stock options and other issuance of Common Shares $ 909   $ 909      
Issuance of Common Shares (in shares) 56,498   110,000      
Compensation on stock-based awards $ 1,789 1,527 $ 1,789 $ 1,527    
Dividend equivalent rights on stock-based awards not paid in cash 194 172 194 172    
Deduct:            
Dividends on Common Shares 36,417 27,680     36,417 27,680
Dividend equivalent rights on stock-based awards 194 172     194 172
Balances at Dec. 31, 2017 529,945 474,374 $ 250,124 $ 242,181 279,821 232,193
Balances (in shares) at Dec. 31, 2018     36,758,000 165    
Add:            
Net Income 63,871 48,012       48,012
Exercise of stock options and other issuance of Common Shares $ 546   $ 546      
Issuance of Common Shares (in shares) 44,906   77,000 19    
Compensation on stock-based awards $ 2,798 2,539 $ 2,798 $ 2,539    
Dividend equivalent rights on stock-based awards not paid in cash 221 192 221 192    
Deduct:            
Dividends on Common Shares 38,937 68,850     38,937 68,850
Dividend equivalent rights on stock-based awards 221 192     221 192
Balances at Dec. 31, 2018 $ 558,223 $ 503,575 $ 253,689 $ 292,412 $ 304,534 $ 211,163