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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | ---
Balance, beginning balance (in shares) at Dec. 31, 2015 |  | 10,751,000 |  |  |
Balance, beginning balance at Dec. 31, 2015 | $ 229,309 | $ 538 | $ 21,368 | $ 207,478 | $ (75)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 26,793 |  |  | 26,793 |
Stock-based compensation (in shares) |  | 48,000 |  |  |
Stock-based compensation | 1,510 | $ 2 | 1,508 |  |
Change in fair value of interest rate swap agreements, net of tax | 120 |  |  |  | 120
Dividends declared | (2,538) |  |  | (2,538) |
Balance, ending balance (in shares) at Dec. 31, 2016 |  | 10,799,000 |  |  |
Balance, ending balance at Dec. 31, 2016 | 255,194 | $ 540 | 22,876 | 231,733 | 45
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 39,096 |  |  | 39,096 |
Stock-based compensation (in shares) |  | 40,000 |  |  |
Stock-based compensation | 1,596 | $ 2 | 1,594 |  |
Change in fair value of interest rate swap agreements, net of tax | 136 |  |  |  | 136
Dividends declared | $ (2,927) |  |  | (2,927) |
Balance, ending balance (in shares) at Dec. 31, 2017 | 10,838,747 | 10,839,000 |  |  |
Balance, ending balance at Dec. 31, 2017 | $ 293,095 | $ 542 | 24,470 | 267,902 | 181
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 35,080 |  |  |  |
Stock-based compensation (in shares) |  | 47,000 |  |  |
Stock-based compensation | 2,164 | $ 2 | 2,162 |  |
Change in fair value of interest rate swap agreements, net of tax | (35) |  |  |  | (35)
Dividends declared | $ (3,374) |  |  | (3,374) |
Balance, ending balance (in shares) at Dec. 31, 2018 | 10,886,036 | 10,886,000 |  |  |
Balance, ending balance at Dec. 31, 2018 | $ 328,395 | $ 544 | $ 26,632 | $ 301,073 | $ 146

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