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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, 2014 | $ 506,801 | $ 435,190 | $ 253,199 | $ 235,607 | $ 253,602 | $ 199,583
Balances (in shares) at Dec. 31, 2014 |  |  | 38,287,000 | 146 |  |
Balances (in shares) at Dec. 31, 2015 |  |  | 36,502,000 | 146 |  |
Add: |  |  |  |  |  |
Net Income | 60,484 | 47,591 |  |  | 60,484 | 47,591
Issuance of Common Shares | $ 1,198 |  | $ 1,198 |  |  |
Issuance of Common Shares (in shares) | 53,612 |  | 120,000 |  |  |
Exercise of stock options (in shares) | 66,458 |  |  |  |  |
Tax benefit from employee stock-based awards | $ 877 | 872 | $ 877 | $ 872 |  |
Compensation on stock-based awards | 2,168 | 2,077 | 2,168 | 2,077 |  |
Dividend equivalent rights on stock-based awards not paid in cash | 270 | 239 | $ 270 | 239 |  |
Stock Repurchased During Period, Shares |  |  | 1,905,000 |  |  |
Stock Repurchased During Period, Value | 72,893 |  | $ 12,690 |  | 60,203 |
Deduct: |  |  |  |  |  |
Dividends on Common Shares | 32,690 | 62,000 |  |  | 32,690 | 62,000
Dividend equivalent rights on stock-based awards | 270 | 239 |  |  | 270 | 239
Balances at Dec. 31, 2015 | 465,945 | 423,730 | $ 245,022 | $ 238,795 | 220,923 | 184,935
Balances (in shares) at Dec. 31, 2016 |  |  | 36,571,000 | 146 |  |
Add: |  |  |  |  |  |
Net Income | $ 59,743 | 46,969 |  |  | 59,743 | 46,969
Issuance of Common Shares |  | 501 |  | $ 501 |  |
Issuance of Common Shares (in shares) | 56,900 |  |  |  |  |
Exercise of stock options (in shares) | 12,546 |  |  |  |  |
Exercise of stock options and other issuance of Common Shares | $ 235 |  | $ 235 |  |  |
Exercise of stock options and other issuance of Common Shares (in shares) |  |  | 69,000 |  |  |
Tax benefit from employee stock-based awards | 581 |  | $ 581 |  |  |
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 |  |  |  | 53,757
Issuance of Common Shares (in shares) | 56,498 |  |  |  |  |
Exercise of stock options (in shares) | 52,936 |  |  |  |  |
Exercise of stock options and other issuance of Common Shares | $ 909 |  | $ 909 |  |  |
Exercise of stock options and other issuance of Common Shares (in shares) |  |  | 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

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