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Consolidated Statements of Changes in Equity (Unaudited) - USD ($) $ in Thousands | Total | Common Stock | Additional Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Beginning Balance, Value at Dec. 31, 2016 | $ 352,845 | $ 5,173 | $ 31,189 | $ 308,995 | $ 7,862 | $ (374)
Beginning Balance, Shares at Dec. 31, 2016 |  | 5,173,000 |  |  |  |
Net income | 62,626 |  |  | 62,626 |  |
Dividends paid | (65,218) |  |  | (65,218) |  |
Change in fair value of marketable securities | (8,494) |  |  |  | (8,494) |
Change in fair value of interest rate cap | (67) |  |  |  | (67) |
Deferred stock unit grants | 394 |  | 394 |  |  |
Other | 0 |  | (6) |  |  | 6
Ending Balance, Value at Sep. 30, 2017 | 342,086 | $ 5,173 | 31,577 | 306,403 | (699) | (368)
Ending Balance, Shares at Sep. 30, 2017 |  | 5,173,000 |  |  |  |
Beginning Balance, Value at Dec. 31, 2017 | $ 343,955 | $ 5,173 | 31,577 | 302,543 | 5,030 | (368)
Beginning Balance, Shares at Dec. 31, 2017 | 5,173,450 | 5,173,000 |  |  |  |
Net income | $ 22,873 |  |  | 22,873 |  |
Dividends paid | (69,072) |  |  | (69,072) |  |
Cumulative effect of change in accounting principle (see Note 3) | 0 |  |  | 5,156 | (5,156) |
Change in fair value of marketable securities | 0 |  |  |  |  |
Change in fair value of interest rate cap | (5) |  |  |  | (5) |
Deferred stock unit grants | 394 |  | 394 |  |  |
Ending Balance, Value at Sep. 30, 2018 | $ 298,145 | $ 5,173 | $ 31,971 | $ 261,500 | $ (131) | $ (368)
Ending Balance, Shares at Sep. 30, 2018 | 5,173,450 | 5,173,000 |  |  |  |

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