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Consolidated Statements of Changes in Stockholders' Equity Statement - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income [Member] | Noncontrolling Interest [Member]
--- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Cumulative effect of change in accounting principle, net of tax effect | $ 0 |  |  | $ 2,203 | $ (2,203) |
Beginning balance at Dec. 31, 2017 | 463,209 | $ 21 | $ 84,866 | 376,119 | 2,203 | $ 0
Beginning balance (in shares) at Dec. 31, 2017 |  | 20,520,856 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income before noncontrolling interest | 1,285 |  |  | 1,285 |  | 0
Share-based compensation | 457 |  | 487 | (30) |  |
Issuance of restricted and deferred stock units | (2,020) |  | (2,020) |  |  |
Issuance of restricted and deferred stock units (in shares) |  | 51,442 |  |  |  |
Employee stock purchase plan | 653 |  | 653 |  |  |
Employee stock purchase plan (in shares) |  | 12,838 |  |  |  |
Dividends paid | (5,754) |  |  | (5,754) |  |
Ending balance at Mar. 31, 2018 | 457,830 | $ 21 | 83,986 | 373,823 | 0 | 0
Ending balance (in shares) at Mar. 31, 2018 |  | 20,585,136 |  |  |  |
Beginning balance at Dec. 31, 2017 | 463,209 | $ 21 | 84,866 | 376,119 | 2,203 | 0
Beginning balance (in shares) at Dec. 31, 2017 |  | 20,520,856 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income before noncontrolling interest | 14,156 |  |  |  |  |
Ending balance at Jun. 30, 2018 | 465,294 | $ 21 | 84,375 | 380,898 | 0 | 0
Ending balance (in shares) at Jun. 30, 2018 |  | 20,594,486 |  |  |  |
Beginning balance at Mar. 31, 2018 | 457,830 | $ 21 | 83,986 | 373,823 | 0 | 0
Beginning balance (in shares) at Mar. 31, 2018 |  | 20,585,136 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income before noncontrolling interest | 12,871 |  |  | 12,871 |  | 0
Share-based compensation | 362 |  | 392 | (30) |  |
Issuance of restricted and deferred stock units | (3) |  | (3) |  |  |
Issuance of restricted and deferred stock units (in shares) |  | 9,350 |  |  |  |
Dividends paid | (5,766) |  |  | (5,766) |  |
Ending balance at Jun. 30, 2018 | 465,294 | $ 21 | 84,375 | 380,898 | 0 | 0
Ending balance (in shares) at Jun. 30, 2018 |  | 20,594,486 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Cumulative effect of change in accounting principle, net of tax effect | 97 |  |  | 97 |  |
Beginning balance at Dec. 31, 2018 | $ 889,312 | $ 28 | 495,366 | 393,918 | 0 | 0
Beginning balance (in shares) at Dec. 31, 2018 | 28,404,316 | 28,404,316 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income before noncontrolling interest | $ 5,873 |  |  | 5,873 |  | 0
Share-based compensation | 870 |  | 886 | (16) |  |
Issuance of restricted and deferred stock units | (132) |  | (132) |  |  |
Issuance of restricted and deferred stock units (in shares) |  | 14,312 |  |  |  |
Employee stock purchase plan | 811 |  | 811 |  |  |
Employee stock purchase plan (in shares) |  | 15,932 |  |  |  |
Common stock issuance cost | (10) |  | (10) |  |  |
Dividends paid | (8,528) |  |  | (8,528) |  |
Ending balance at Mar. 31, 2019 | 888,293 | $ 28 | 496,921 | 391,344 | 0 | 0
Ending balance (in shares) at Mar. 31, 2019 |  | 28,434,560 |  |  |  |
Beginning balance at Dec. 31, 2018 | $ 889,312 | $ 28 | 495,366 | 393,918 | 0 | 0
Beginning balance (in shares) at Dec. 31, 2018 | 28,404,316 | 28,404,316 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income before noncontrolling interest | $ 19,635 |  |  |  |  |
Ending balance at Jun. 30, 2019 | $ 893,995 | $ 28 | 497,633 | 396,334 | 0 | 0
Ending balance (in shares) at Jun. 30, 2019 | 28,442,139 | 28,442,139 |  |  |  |
Beginning balance at Mar. 31, 2019 | $ 888,293 | $ 28 | 496,921 | 391,344 | 0 | 0
Beginning balance (in shares) at Mar. 31, 2019 |  | 28,434,560 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income before noncontrolling interest | 13,762 |  |  | 13,538 |  | 224
Distribution to noncontrolling interest | (224) |  |  |  |  | (224)
Share-based compensation | 702 |  | 718 | (16) |  |
Issuance of restricted and deferred stock units | (6) |  | (6) |  |  |
Issuance of restricted and deferred stock units (in shares) |  | 7,579 |  |  |  |
Dividends paid | (8,532) |  |  | (8,532) |  |
Ending balance at Jun. 30, 2019 | $ 893,995 | $ 28 | $ 497,633 | $ 396,334 | $ 0 | $ 0
Ending balance (in shares) at Jun. 30, 2019 | 28,442,139 | 28,442,139 |  |  |  |

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