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CONSOLIDATED STATEMENTS OF CHANGE IN COMMON SHAREHOLDERS' EQUITY Statement - USD ($) $ in Thousands | Total | Common Stock [Member] | Retained Earnings [Member] | Golden State Water Company [Member] | Golden State Water Company [Member] Common Stock [Member] | Golden State Water Company [Member] Retained Earnings [Member]
--- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2017 |  | 36,681,000 |  |  | 146 |
Beginning balances at Dec. 31, 2017 | $ 529,945 | $ 250,124 | $ 279,821 | $ 474,374 | $ 242,181 | $ 232,193
Add: |  |  |  |  |  |
Net income | $ 10,782 |  | 10,782 | 8,890 |  | 8,890
Exercise of stock options and other issuance of Common Shares (in shares) | 52,622 | 52,000 |  |  |  |
Exercise of stock options and other issuances of Common Shares | $ 340 | $ 340 |  |  |  |
Stock-based compensation, net of taxes paid from shares withheld from employees related to net share settlements (Note 4) | (181) | (181) |  | (266) | (266) |
Dividend equivalent rights on stock-based awards not paid in cash | 56 | 56 |  | 49 | 49 |
Deduct: |  |  |  |  |  |
Dividends on Common Shares | 9,362 |  | 9,362 | 9,380 |  | 9,380
Dividend equivalent rights on stock-based awards not paid in cash | 56 |  | 56 | 49 |  | 49
Ending balances at Mar. 31, 2018 | 531,524 | $ 250,339 | 281,185 | 473,618 | $ 241,964 | 231,654
Balances (in shares) at Mar. 31, 2018 |  | 36,733,000 |  |  | 146 |
Balance (in shares) at Dec. 31, 2018 |  | 36,758,000 |  |  | 165 |
Beginning balances at Dec. 31, 2018 | 558,223 | $ 253,689 | 304,534 | 503,575 | $ 292,412 | 211,163
Add: |  |  |  |  |  |
Net income | $ 12,852 |  |  | 9,022 |  | 9,022
Exercise of stock options and other issuance of Common Shares (in shares) | 37,376 | 37,000 |  |  |  |
Exercise of stock options and other issuances of Common Shares | $ 75 | $ 75 |  |  |  |
Stock-based compensation, net of taxes paid from shares withheld from employees related to net share settlements (Note 4) | 463 | 463 |  | 572 | 572 |
Dividend equivalent rights on stock-based awards not paid in cash | 70 | 70 |  | 60 | 60 |
Deduct: |  |  |  |  |  |
Dividends on Common Shares | 10,113 |  | 10,113 | 10,100 |  | 10,100
Dividend equivalent rights on stock-based awards not paid in cash | 70 |  | 70 | 60 |  | 60
Ending balances at Mar. 31, 2019 | $ 561,500 | $ 254,297 | $ 307,203 | $ 503,069 | $ 293,044 | $ 210,025
Balances (in shares) at Mar. 31, 2019 |  | 36,795,000 |  |  | 165 |

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