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Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment | Common Stock | Additional Paid-in Capital | Retained Earnings | Retained Earnings Cumulative Effect, Period of Adoption, Adjustment | Accumulated Other Comprehensive Income (Loss) | Noncontrolling Interest
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2018 |  |  | 28,404,316 |  |  |  |  |
Beginning balance at Dec. 31, 2018 | $ 889,312 | $ 97 | $ 28 | $ 495,366 | $ 393,918 | $ 97 | $ 0 | $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | 23,627 |  |  |  | 23,403 |  |  | 224
Distribution to noncontrolling interest | (224) |  |  |  |  |  |  | (224)
Unrealized gain (loss) on investment, net of tax effect | 117 |  |  |  |  |  | 117 |
Adjustment to pension benefit plans, net of taxes | 9 |  |  |  |  |  | 9 |
Share-based compensation | 3,313 |  |  | 3,406 | (93) |  |  |
Share-based compensation related to business combination | 6,384 |  |  | 6,384 |  |  |  |
Issuance of restricted and deferred stock units (in shares) |  |  | 21,909 |  |  |  |  |
Issuance of restricted and deferred stock units | $ (110) |  |  | (110) |  |  |  |
Employee stock purchase plan (in shares) | 30,255 |  | 30,283 |  |  |  |  |
Employee stock purchase plan | $ 1,603 |  |  | 1,603 |  |  |  |
Common stock issuance, net of costs | (10) |  |  | (10) |  |  |  |
Dividends paid | (34,134) |  |  |  | (34,134) |  |  |
Ending balance (in shares) at Dec. 31, 2019 |  |  | 28,456,508 |  |  |  |  |
Ending balance at Dec. 31, 2019 | 889,984 |  | $ 28 | 506,639 | 383,191 |  | 126 | 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | 61,515 |  |  |  | 61,515 |  |  |
Unrealized gain (loss) on investment, net of tax effect | (310) |  |  |  |  |  | (310) |
Adjustment to pension benefit plans, net of taxes | (880) |  |  |  |  |  | (880) |
Share-based compensation | 3,393 |  |  | 3,553 | (160) |  |  |
Issuance of restricted and deferred stock units (in shares) |  |  | 68,347 |  |  |  |  |
Issuance of restricted and deferred stock units | $ (1,863) |  | $ 1 | (1,864) |  |  |  |
Employee stock purchase plan (in shares) | 31,750 |  | 31,750 |  |  |  |  |
Employee stock purchase plan | $ 1,830 |  |  | 1,830 |  |  |  |
Dividends paid | $ (36,509) |  |  |  | (36,509) |  |  |
Ending balance (in shares) at Dec. 31, 2020 | 28,556,605 |  | 28,556,605 |  |  |  |  |
Ending balance at Dec. 31, 2020 | $ 917,160 |  | $ 29 | 510,158 | 408,037 |  | (1,064) | 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | 60,478 |  |  |  | 60,478 |  |  |
Unrealized gain (loss) on investment, net of tax effect | 185 |  |  |  |  |  | 185 |
Adjustment to pension benefit plans, net of taxes | 716 |  |  |  |  |  | 716 |
Share-based compensation | 4,128 |  |  | 4,246 | (118) |  |  |
Issuance of restricted and deferred stock units (in shares) |  |  | 49,824 |  |  |  |  |
Issuance of restricted and deferred stock units | $ (1,066) |  |  | (1,066) |  |  |  |
Employee stock purchase plan (in shares) | 35,304 |  | 35,304 |  |  |  |  |
Employee stock purchase plan | $ 2,026 |  |  | 2,026 |  |  |  |
Common stock issuance, net of costs (in shares) |  |  | 1,539,615 |  |  |  |  |
Common stock issuance, net of costs | 91,029 |  | $ 1 | 91,028 |  |  |  |
Dividends paid | $ (40,137) |  |  |  | (40,137) |  |  |
Ending balance (in shares) at Dec. 31, 2021 | 30,181,348 |  | 30,181,348 |  |  |  |  |
Ending balance at Dec. 31, 2021 | $ 1,034,519 |  | $ 30 | $ 606,392 | $ 428,260 |  | $ (163) | $ 0

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