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Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income [Member] | Noncontrolling Interest [Member]
--- | --- | --- | --- | --- | --- | ---
Balance, value at Dec. 31, 2014 | $ 360,155 | $ 21 | $ 76,844 | $ 280,773 | $ 2,517 | $ 0
Balance, shares at Dec. 31, 2014 |  | 20,286,840 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 37,882 | $ 0 | 0 | 37,882 | 0 | 0
Cumulative effect of change in accounting principle, net of tax effect of $300 | (436) |  |  | (436) |  |
Unrealized loss on investment, net of tax effect | (206) | 0 | 0 | 0 | (206) | 0
Reclassification adjustment for gain realized on investment, net of tax | 0 |  |  |  |  |
Share-based compensation | 1,489 | 0 | 1,603 | (114) | 0 |
Issuance of restricted and deferred stock units, value | (111) | $ 0 | (111) | 0 | 0 | 0
Issuance of restricted and deferred stock units, shares |  | 61,791 |  |  |  |
Employee stock purchase plan, value | $ 895 | $ 0 | 895 | 0 | 0 | 0
Employee stock purchase plan, shares | 33,318 | 33,318 |  |  |  |
Dividends | $ (15,885) | $ 0 | 0 | (15,885) | 0 |
Balance, value at Dec. 31, 2015 | 383,783 | $ 21 | 79,231 | 302,220 | 2,311 | 0
Balance, shares at Dec. 31, 2015 |  | 20,381,949 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 52,839 | $ 0 | 0 | 52,839 | 0 | 0
Unrealized loss on investment, net of tax effect | 955 | 0 | 0 | 0 | 955 | 0
Reclassification adjustment for gain realized on investment, net of tax | (1,742) | 0 | 0 | 0 | (1,742) |
Share-based compensation | 1,577 | 0 | 1,691 | (114) | 0 |
Issuance of restricted and deferred stock units, value | (161) | $ 0 | (161) | 0 | 0 | 0
Issuance of restricted and deferred stock units, shares |  | 44,062 |  |  |  |
Employee stock purchase plan, value | $ 954 | $ 0 | 954 | 0 | 0 | 0
Employee stock purchase plan, shares | 30,214 | 30,214 |  |  |  |
Dividends | $ (16,559) | $ 0 | 0 | (16,559) | 0 | 0
Balance, value at Dec. 31, 2016 | $ 421,646 | $ 21 | 81,715 | 338,386 | 1,524 | 0
Balance, shares at Dec. 31, 2016 | 20,456,225 | 20,456,225 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | $ 61,100 | $ 0 | 0 | 59,204 | 0 | 1,896
Distribution to noncontrolling interest | (1,896) |  |  |  |  | (1,896)
Unrealized loss on investment, net of tax effect | 679 | 0 | 0 | 0 | 679 | 0
Reclassification adjustment for gain realized on investment, net of tax | 0 |  |  |  |  |
Share-based compensation | 2,504 | 0 | 2,643 | (139) | 0 |
Issuance of restricted and deferred stock units, value | (707) | $ 0 | (707) | 0 | 0 | 0
Issuance of restricted and deferred stock units, shares |  | 36,888 |  |  |  |
Employee stock purchase plan, value | $ 1,215 | $ 0 | 1,215 | 0 | 0 | 0
Employee stock purchase plan, shares | 27,743 | 27,743 |  |  |  |
Dividends | $ (21,332) | $ 0 | 0 | (21,332) | 0 | 0
Balance, value at Dec. 31, 2017 | $ 463,209 | $ 21 | $ 84,866 | $ 376,119 | $ 2,203 | $ 0
Balance, shares at Dec. 31, 2017 | 20,520,856 | 20,520,856 |  |  |  |

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