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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands | Total | Common Stock [Member] | Additional Paid In Capital [Member] | Retained Earnings [Member] | Treasury Stock [Member] | Accumulated Other Comprehensive Income [Member]
--- | --- | --- | --- | --- | --- | ---
BALANCE at Dec. 31, 2016 | $ 153,977 | $ 321 | $ 158,581 | $ 7,294 |  |
BALANCE, Shares at Dec. 31, 2016 |  | 32,135,176 |  |  |  |
BALANCE, Treasury Stock, Value at Dec. 31, 2016 |  |  |  |  | $ (12,219) |
BALANCE, Treasury Stock, Shares at Dec. 31, 2016 |  |  |  |  | (650,402) |
Net income | 30,347 |  |  | 30,347 |  |
Purchase of remaining interest in subsidiary | (1,890) |  | (1,890) |  |  |
Issuance of common stock for acquisition, value | 10,859 | $ 3 | 10,856 |  |  |
Issuance of common stock for acquisition, shares |  | 282,577 |  |  |  |
Issuance of common stock awards to employees, value |  | $ 1 | (1) |  |  |
Issuance of common stock awards to employees, shares |  | 101,241 |  |  |  |
Surrender of common stock awards by employees, value | (550) |  |  |  | $ (550) |
Surrender of common stock awards by employees, shares |  |  |  |  | (11,971) |
Share-based compensation expense | 4,360 |  | 4,360 |  |  |
Share-based compensation issued to directors, value | 300 |  | 300 |  |  |
Share-based compensation issued to directors, shares |  | 5,940 |  |  |  |
Other comprehensive (loss) income, net of tax | (45) |  |  |  |  | $ (45)
BALANCE at Sep. 30, 2017 | 197,358 | $ 325 | 172,206 | 37,641 |  | (45)
BALANCE, Shares at Sep. 30, 2017 |  | 32,524,934 |  |  |  |
BALANCE, Treasury Stock, Value at Sep. 30, 2017 |  |  |  |  | $ (12,769) |
BALANCE, Treasury Stock, Shares at Sep. 30, 2017 |  |  |  |  | (662,373) |
BALANCE at Dec. 31, 2017 | $ 210,528 | $ 325 | 174,043 | 48,434 | $ (12,781) | 507
BALANCE, Shares at Dec. 31, 2017 | 32,524,934 | 32,524,934 |  |  |  |
BALANCE, Treasury Stock, Value at Dec. 31, 2017 | $ (12,781) |  |  |  | $ (12,781) |
BALANCE, Treasury Stock, Shares at Dec. 31, 2017 | (662,788) |  |  |  | (662,788) |
Net income | $ 38,272 |  |  | 38,272 |  |
Cumulative effect of accounting changes, net of tax | 2,142 |  |  | 2,030 |  | 112
Issuance of common stock awards to employees, value |  | $ 2 | (2) |  |  |
Issuance of common stock awards to employees, shares |  | 194,093 |  |  |  |
Surrender of common stock awards by employees, value | (2,282) |  |  |  | $ (2,282) |
Surrender of common stock awards by employees, shares |  |  |  |  | (42,799) |
Share-based compensation expense | 5,965 |  | 5,965 |  |  |
Share-based compensation issued to directors, value | 100 |  | 100 |  |  |
Share-based compensation issued to directors, shares |  | 4,945 |  |  |  |
Common stock repurchase, value | (42,827) |  |  |  | $ (42,827) |
Common stock repurchase, shares |  |  |  |  | (793,411) |
Other comprehensive (loss) income, net of tax | 2,453 |  |  |  |  | 2,453
BALANCE at Sep. 30, 2018 | $ 214,351 | $ 327 | $ 180,106 | $ 88,736 |  | $ 3,072
BALANCE, Shares at Sep. 30, 2018 | 32,723,972 | 32,723,972 |  |  |  |
BALANCE, Treasury Stock, Value at Sep. 30, 2018 | $ (57,890) |  |  |  | $ (57,890) |
BALANCE, Treasury Stock, Shares at Sep. 30, 2018 | (1,498,998) |  |  |  | (1,498,998) |

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