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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
Common stock, shares outstanding     36,681,000 146    
Balances at Dec. 31, 2017 $ 529,945 $ 474,374 $ 250,124 $ 242,181 $ 279,821 $ 232,193
Add:            
Net Income 63,871 48,012     63,871 48,012
Exercise of stock options and other issuance of Common Shares     77,000 19    
Exercise of stock options and other issuance of Common Shares 546 47,500 $ 546 $ 47,500    
Stock-based compensation, net of taxes paid from shares withheld from employees related to net share settlements 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
Common stock, shares outstanding     36,758,000 165    
Add:            
Net Income 84,342 66,663     84,342 66,663
Exercise of stock options and other issuance of Common Shares     89,000 0    
Exercise of stock options and other issuance of Common Shares 519   $ 519      
Stock-based compensation, net of taxes paid from shares withheld from employees related to net share settlements 1,148 1,150 1,148 $ 1,150    
Dividend equivalent rights on stock-based awards not paid in cash 210 192 210 192    
Deduct:            
Dividends on Common Shares 42,702 20,200     42,702 20,200
Dividend equivalent rights on stock-based awards 210 192     210 192
Balances at Dec. 31, 2019 $ 601,530 $ 551,188 $ 255,566 $ 293,754 345,964 257,434
Common stock, shares outstanding 36,846,614 165 36,847,000 165    
Add:            
Net Income $ 86,425 $ 64,971     86,425 64,971
Exercise of stock options and other issuance of Common Shares     42,000 5    
Exercise of stock options and other issuance of Common Shares 30 60,000 $ 30 $ 60,000    
Stock-based compensation, net of taxes paid from shares withheld from employees related to net share settlements 894 983 894 983    
Dividend equivalent rights on stock-based awards not paid in cash 176 169 176 169    
Deduct:            
Dividends on Common Shares 47,206 22,500     47,206 22,500
Dividends   71,344       71,344
Dividend equivalent rights on stock-based awards 176 169     176 169
Balances at Dec. 31, 2020 $ 641,673 $ 583,298 $ 256,666 $ 354,906 $ 385,007 $ 228,392
Common stock, shares outstanding 36,889,103 170 36,889,000 170