CONSOLIDATED STATEMENTS OF CHANGE IN COMMON SHAREHOLDERS' EQUITY Statement - USD ($) $ in Thousands	Total	Common Shares	Retained Earnings	GSWC	GSWC Common Shares	GSWC Retained Earnings
Beginning balances (in shares) at Dec. 31, 2020		36,889,000			170
Beginning balances at Dec. 31, 2020	$ 641,673	$ 256,666	$ 385,007	$ 583,298	$ 354,906	$ 228,392
Add:
Net income	$ 19,268		19,268	12,231		12,231
Exercise of stock options and other issuance of Common Shares (in shares)	23,914	24,000
Exercise of stock options and other issuances of Common Shares	$ 0	$ 0
Stock-based compensation, net of taxes paid from shares withheld from employees related to net share settlements	813	813		782	782
Dividend equivalent rights on stock-based awards not paid in cash	49	$ 49		45	$ 45
Deduct:
Dividends on Common Shares	12,361		12,361	12,400		12,400
Dividend equivalent rights on stock-based awards not paid in cash	49		49	45		45
Ending balances (in shares) at Mar. 31, 2021		36,913,000			170
Ending balances at Mar. 31, 2021	649,393	$ 257,528	391,865	583,911	$ 355,733	228,178
Beginning balances (in shares) at Dec. 31, 2021		36,936,000			170
Beginning balances at Dec. 31, 2021	685,947	$ 258,442	427,505	615,686	$ 356,530	259,156
Add:
Net income	$ 14,162		14,162	8,567		8,567
Exercise of stock options and other issuance of Common Shares (in shares)	19,348	20,000
Exercise of stock options and other issuances of Common Shares	$ 0	$ 0
Stock-based compensation, net of taxes paid from shares withheld from employees related to net share settlements	801	801		742	742
Dividend equivalent rights on stock-based awards not paid in cash	41	$ 41		39	$ 39
Deduct:
Dividends on Common Shares	13,485		13,485	13,500		13,500
Dividend equivalent rights on stock-based awards not paid in cash	41		41	39		39
Ending balances (in shares) at Mar. 31, 2022		36,956,000			170
Ending balances at Mar. 31, 2022	$ 687,425	$ 259,284	$ 428,141	$ 611,495	$ 357,311	$ 254,184