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Consolidated Statements of Changes in Equity - USD ($) $ in Thousands | Total | Common Stock | Additional Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2015 | $ 352,880 | $ 5,173 | $ 30,739 | $ 304,340 | $ 13,002 | $ (374)
Balance (in shares) at Dec. 31, 2015 |  | 5,173,000 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 86,477 |  |  | 86,477 |  |
Dividends paid | (81,822) |  |  | (81,822) |  |
Change in fair value of marketable securities | (5,273) |  |  |  | (5,273) |
Change in value of interest rate cap | 133 |  |  |  | 133 |
Deferred stock unit grants | 450 |  | 450 |  |  |
Balance (in shares) at Dec. 31, 2016 |  | 5,173,000 |  |  |  |
Balance at Dec. 31, 2016 | 352,845 | $ 5,173 | 31,189 | 308,995 | 7,862 | (374)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 80,509 |  |  | 80,509 |  |
Dividends paid | (86,961) |  |  | (86,961) |  |
Change in fair value of marketable securities | (2,762) |  |  |  | (2,762) |
Change in value of interest rate cap | (70) |  |  |  | (70) |
Deferred stock unit grants | 394 |  | 394 |  |  |
Other | $ 0 |  | (6) |  |  | 6
Balance (in shares) at Dec. 31, 2017 | 5,173,450 | 5,173,000 |  |  |  |
Balance at Dec. 31, 2017 | $ 343,955 | $ 5,173 | 31,577 | 302,543 | 5,030 | (368)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Cumulative effect of change in accounting principle (see Note 2) | 0 |  |  | 5,156 | (5,156) |
Net income | 32,844 |  |  | 32,844 |  |
Dividends paid | (92,100) |  |  | (92,100) |  |
Change in fair value of marketable securities | 0 |  |  |  |  |
Change in value of interest rate cap | (1) |  |  |  | (1) |
Deferred stock unit grants | $ 394 |  | 394 |  |  |
Balance (in shares) at Dec. 31, 2018 | 5,173,450 | 5,173,000 |  |  |  |
Balance at Dec. 31, 2018 | $ 285,092 | $ 5,173 | $ 31,971 | $ 248,443 | $ (127) | $ (368)

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