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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock [Member] | Additional Paid In Capital [Member] | Accumulated Deficit / Retained Earnings [Member] | Treasury Stock [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
--- | --- | --- | --- | --- | --- | ---
BALANCE at Dec. 31, 2015 | $ 114,483 | $ 320 | $ 156,688 | $ (31,142) |  |
BALANCE, Shares at Dec. 31, 2015 |  | 31,982,888 |  |  |  |
BALANCE, Treasury Stock, Value at Dec. 31, 2015 |  |  |  |  | $ (11,383) |
BALANCE, Treasury Stock, Shares at Dec. 31, 2015 |  |  |  |  | (616,560) |
Net income | 38,436 |  |  | 38,436 |  |
Issuance of common stock awards to employees, value |  | $ 1 | (1) |  |  |
Issuance of common stock awards to employees, shares |  | 143,528 |  |  |  |
Surrender of common stock awards by employees, value | (836) |  |  |  | $ (836) |
Surrender of common stock awards by employees, shares |  |  |  |  | (33,842) |
Share-based compensation expense | 1,594 |  | 1,594 |  |  |
Share-based compensation issued to directors, value | 300 |  | 300 |  |  |
Share-based compensation issued to directors, shares |  | 8,760 |  |  |  |
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 | 41,140 |  |  | 41,140 |  |
Purchase of remaining interest in subsidiary | (1,888) |  | (1,888) |  |  |
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 | (562) |  |  |  | $ (562) |
Surrender of common stock awards by employees, shares |  |  |  |  | (12,386) |
Share-based compensation expense | 6,195 |  | 6,195 |  |  |
Share-based compensation issued to directors, value | 300 |  | 300 |  |  |
Share-based compensation issued to directors, shares |  | 5,940 |  |  |  |
Other comprehensive income (loss), net of tax | 507 |  |  |  |  | $ 507
BALANCE at Dec. 31, 2017 | $ 210,528 | $ 325 | 174,043 | 48,434 |  | 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 | $ 54,748 |  |  | 54,748 |  |
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 |  |  |  |  | (43,871) |
Share-based compensation expense | 7,598 |  | 7,598 |  |  |
Share-based compensation issued to directors, value | 176 |  | 176 |  |  |
Share-based compensation issued to directors, shares |  | 4,945 |  |  |  |
Common stock repurchase, value | (89,362) |  |  |  | $ (89,362) |
Common stock repurchase, shares |  |  |  |  | (2,101,702) |
Other comprehensive income (loss), net of tax | (1,050) |  |  |  |  | (1,050)
BALANCE at Dec. 31, 2018 | $ 182,498 | $ 327 | $ 181,815 | $ 105,212 |  | $ (431)
BALANCE, Shares at Dec. 31, 2018 | 32,723,972 | 32,723,972 |  |  |  |
BALANCE, Treasury Stock, Value at Dec. 31, 2018 | $ (104,425) |  |  |  | $ (104,425) |
BALANCE, Treasury Stock, Shares at Dec. 31, 2018 | (2,808,361) |  |  |  | (2,808,361) |

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