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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY (UNAUDITED) - USD ($) $ in Thousands | Total | Common Stock | Treasury Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2017 |  | 40,393,033 | 81,052 |  |  |
Beginning balance at Dec. 31, 2017 | $ 190,022 | $ 40 | $ (666) | $ 159,059 | $ 31,589 | $ 0
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Vesting of restricted stock (in shares) |  | 96,713 |  |  |  |
Stock-based compensation | 610 |  |  | 610 |  |
Employee stock purchase plan compensation | 70 |  |  | 70 |  |
Employee stock purchase plan issuance (in shares) |  | 9,639 |  |  |  |
Restricted stock buy back (in shares) |  | (8,822) | 8,822 |  |  |
Restricted stock buy back | (54) |  | $ (54) |  |  |
Net income | 975 |  |  |  | 975 |
Ending balance (in shares) at Mar. 31, 2018 |  | 40,490,563 | 89,874 |  |  |
Ending balance at Mar. 31, 2018 | 191,623 | $ 40 | $ (720) | 159,739 | 32,564 | 0
Beginning balance (in shares) at Dec. 31, 2017 |  | 40,393,033 | 81,052 |  |  |
Beginning balance at Dec. 31, 2017 | 190,022 | $ 40 | $ (666) | 159,059 | 31,589 | 0
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Foreign currency translation adjustment | (54) |  |  |  |  |
Net income | 23,121 |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2018 |  | 40,550,353 | 110,835 |  |  |
Ending balance at Sep. 30, 2018 | 215,231 | $ 40 | $ (840) | 161,375 | 54,710 | (54)
Beginning balance (in shares) at Mar. 31, 2018 |  | 40,490,563 | 89,874 |  |  |
Beginning balance at Mar. 31, 2018 | 191,623 | $ 40 | $ (720) | 159,739 | 32,564 | 0
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Foreign currency translation adjustment | 76 |  |  |  |  | 76
Vesting of restricted stock (in shares) |  | 59,400 |  |  |  |
Stock-based compensation | 650 |  |  | 650 |  |
Employee stock purchase plan compensation | 38 |  |  | 38 |  |
Employee stock purchase plan issuance (in shares) |  | 0 |  |  |  |
Employee stock purchase plan issuance | 1 |  |  | 1 |  |
Restricted stock buy back (in shares) |  | (20,781) | 20,781 |  |  |
Restricted stock buy back | (119) |  | $ (119) |  |  |
Net income | 10,021 |  |  |  | 10,021 |
Ending balance (in shares) at Jun. 30, 2018 |  | 40,529,182 | 110,655 |  |  |
Ending balance at Jun. 30, 2018 | 202,290 | $ 40 | $ (839) | 160,428 | 42,585 | 76
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Foreign currency translation adjustment | (130) |  |  |  |  | (130)
Vesting of restricted stock (in shares) |  | 21,351 |  |  |  |
Stock-based compensation | 873 |  |  | 873 |  |
Employee stock purchase plan compensation | 18 |  |  | 18 |  |
Employee stock purchase plan issuance (in shares) |  | 0 |  |  |  |
Employee stock purchase plan issuance | 56 |  |  | 56 |  |
Restricted stock buy back (in shares) |  | (180) | 180 |  |  |
Restricted stock buy back | (1) |  | $ (1) |  |  |
Net income | 12,125 |  |  |  | 12,125 |
Ending balance (in shares) at Sep. 30, 2018 |  | 40,550,353 | 110,835 |  |  |
Ending balance at Sep. 30, 2018 | 215,231 | $ 40 | $ (840) | 161,375 | 54,710 | (54)
Beginning balance (in shares) at Dec. 31, 2018 |  | 39,974,478 | 699,035 |  |  |
Beginning balance at Dec. 31, 2018 | 209,360 | $ 40 | $ (2,839) | 162,195 | 50,277 | (313)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Foreign currency translation adjustment | 145 |  |  |  |  | 145
Vesting of restricted stock (in shares) |  | 30,729 |  |  |  |
Stock-based compensation | 790 |  |  | 790 |  |
Employee stock purchase plan compensation | 9 |  |  | 9 |  |
Employee stock purchase plan issuance (in shares) |  | 20,954 |  |  |  |
Employee stock purchase plan issuance | 40 |  |  | 40 |  |
Restricted stock buy back (in shares) |  | (5,714) | 5,714 |  |  |
Restricted stock buy back | (23) |  | $ (23) |  |  |
Net income | 4,033 |  |  |  | 4,033 |
Ending balance (in shares) at Mar. 31, 2019 |  | 40,020,447 | 704,749 |  |  |
Ending balance at Mar. 31, 2019 | 214,354 | $ 40 | $ (2,862) | 163,034 | 54,310 | (168)
Beginning balance (in shares) at Dec. 31, 2018 |  | 39,974,478 | 699,035 |  |  |
Beginning balance at Dec. 31, 2018 | 209,360 | $ 40 | $ (2,839) | 162,195 | 50,277 | (313)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Foreign currency translation adjustment | 190 |  |  |  |  |
Net income | 29,235 |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2019 |  | 40,233,850 | 740,620 |  |  |
Ending balance at Sep. 30, 2019 | 240,950 | $ 40 | $ (2,978) | 164,499 | 79,512 | (123)
Beginning balance (in shares) at Mar. 31, 2019 |  | 40,020,447 | 704,749 |  |  |
Beginning balance at Mar. 31, 2019 | 214,354 | $ 40 | $ (2,862) | 163,034 | 54,310 | (168)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Foreign currency translation adjustment | 91 |  |  |  |  | 91
Vesting of restricted stock (in shares) |  | 224,653 |  |  |  |
Stock-based compensation | 754 |  |  | 754 |  |
Employee stock purchase plan compensation | 9 |  |  | 9 |  |
Employee stock purchase plan issuance (in shares) |  | 0 |  |  |  |
Employee stock purchase plan issuance | 0 |  |  | 0 |  |
Restricted stock buy back (in shares) |  | (35,691) | 35,691 |  |  |
Restricted stock buy back | (116) |  | $ (116) |  |  |
Net income | 14,276 |  |  |  | 14,276 |
Ending balance (in shares) at Jun. 30, 2019 |  | 40,209,409 | 740,440 |  |  |
Ending balance at Jun. 30, 2019 | 229,368 | $ 40 | $ (2,978) | 163,797 | 68,586 | (77)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Foreign currency translation adjustment | (46) |  |  |  |  | (46)
Vesting of restricted stock (in shares) |  | 4,500 |  |  |  |
Stock-based compensation | 652 |  |  | 652 |  |
Employee stock purchase plan compensation | 12 |  |  | 12 |  |
Employee stock purchase plan issuance (in shares) |  | 20,121 |  |  |  |
Employee stock purchase plan issuance | 38 |  |  | 38 |  |
Restricted stock buy back (in shares) |  | (180) | 180 |  |  |
Restricted stock buy back | 0 |  |  |  |  |
Net income | 10,926 |  |  |  | 10,926 |
Ending balance (in shares) at Sep. 30, 2019 |  | 40,233,850 | 740,620 |  |  |
Ending balance at Sep. 30, 2019 | $ 240,950 | $ 40 | $ (2,978) | $ 164,499 | $ 79,512 | $ (123)

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