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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Retained Earnings (Accumulated Deficit) | Treasury Stock | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2017 |  | 30,482,966 |  |  |  |
Beginning balance at Dec. 31, 2017 | $ 376,325 | $ 305 | $ 263,081 | $ 121,985 | $ 0 | $ (9,046)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net Income | 11,593 |  |  | 11,593 |  |
Comprehensive income |  |  |  |  |  |
Foreign exchange translation adjustments | (1) |  |  |  |  | (1)
Cash-flow Hedges | 0 |  |  |  |  |
Pension obligation adjustments | 0 |  |  | (410) |  | 410
Other comprehensive income (loss), net of tax | (1) |  |  | (410) |  | 409
Issuance of common stock (in shares) |  | 25,356 |  |  |  |
Issuance of common stock | 0 |  |  |  |  |
Purchase of treasury shares | (370) |  | (370) |  |  |
Stock-based compensation | 2,281 |  | 2,281 |  |  |
Ending balance (in shares) at Mar. 31, 2018 |  | 30,508,322 |  |  |  |
Ending balance at Mar. 31, 2018 | 389,828 | $ 305 | 264,992 | 133,168 | 0 | (8,637)
Beginning balance (in shares) at Dec. 31, 2017 |  | 30,482,966 |  |  |  |
Beginning balance at Dec. 31, 2017 | 376,325 | $ 305 | 263,081 | 121,985 | 0 | (9,046)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net Income | 40,003 |  |  |  |  |
Comprehensive income |  |  |  |  |  |
Cash-flow Hedges | 0 |  |  |  |  |
Ending balance (in shares) at Jun. 30, 2018 |  | 30,524,738 |  |  |  |
Ending balance at Jun. 30, 2018 | 418,077 | $ 305 | 264,849 | 161,578 | (1) | (8,654)
Beginning balance (in shares) at Mar. 31, 2018 |  | 30,508,322 |  |  |  |
Beginning balance at Mar. 31, 2018 | 389,828 | $ 305 | 264,992 | 133,168 | 0 | (8,637)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net Income | 28,410 |  |  | 28,410 |  |
Comprehensive income |  |  |  |  |  |
Foreign exchange translation adjustments | (17) |  |  |  |  | (17)
Cash-flow Hedges | 0 |  |  |  |  |
Pension obligation adjustments | 0 |  |  |  |  |
Other comprehensive income (loss), net of tax | (17) |  |  |  |  | (17)
Issuance of common stock (in shares) |  | 16,416 |  |  |  |
Issuance of common stock | 0 |  |  |  |  |
Purchase of treasury shares | (2,743) |  | (2,742) |  | (1) |
Stock-based compensation | 2,599 |  | 2,599 |  |  |
Ending balance (in shares) at Jun. 30, 2018 |  | 30,524,738 |  |  |  |
Ending balance at Jun. 30, 2018 | $ 418,077 | $ 305 | 264,849 | 161,578 | (1) | (8,654)
Beginning balance (in shares) at Dec. 31, 2018 | 29,345,001 | 30,555,715 |  |  |  |
Beginning balance at Dec. 31, 2018 | $ 420,338 | $ 306 | 234,699 | 187,819 | (12) | (2,474)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net Income | 20,174 |  |  | 20,174 |  |
Comprehensive income |  |  |  |  |  |
Foreign exchange translation adjustments | (1) |  |  |  |  | (1)
Cash-flow Hedges | (192) |  |  |  |  | (192)
Pension obligation adjustments | 0 |  |  |  |  |
Other comprehensive income (loss), net of tax | (193) |  |  |  |  | (193)
Issuance of common stock (in shares) |  | 22,497 |  |  |  |
Issuance of common stock | 16 |  | 16 |  |  |
Purchase of treasury shares | (23,853) |  | (23,845) |  | (8) |
Stock-based compensation | 2,762 |  | 2,762 |  |  |
Ending balance (in shares) at Mar. 31, 2019 |  | 30,578,212 |  |  |  |
Ending balance at Mar. 31, 2019 | $ 419,244 | $ 306 | 213,632 | 207,993 | (20) | (2,667)
Beginning balance (in shares) at Dec. 31, 2018 | 29,345,001 | 30,555,715 |  |  |  |
Beginning balance at Dec. 31, 2018 | $ 420,338 | $ 306 | 234,699 | 187,819 | (12) | (2,474)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net Income | 35,520 |  |  |  |  |
Comprehensive income |  |  |  |  |  |
Cash-flow Hedges | $ (621) |  |  |  |  |
Ending balance (in shares) at Jun. 30, 2019 | 28,008,959 | 30,591,472 |  |  |  |
Ending balance at Jun. 30, 2019 | $ 420,563 | $ 306 | 200,036 | 223,339 | (26) | (3,092)
Beginning balance (in shares) at Mar. 31, 2019 |  | 30,578,212 |  |  |  |
Beginning balance at Mar. 31, 2019 | 419,244 | $ 306 | 213,632 | 207,993 | (20) | (2,667)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net Income | 15,346 |  |  | 15,346 |  |
Comprehensive income |  |  |  |  |  |
Foreign exchange translation adjustments | 4 |  |  |  |  | 4
Cash-flow Hedges | (429) |  |  |  |  | (429)
Pension obligation adjustments | 0 |  |  |  |  |
Other comprehensive income (loss), net of tax | (425) |  |  |  |  | (425)
Issuance of common stock (in shares) |  | 13,260 |  |  |  |
Issuance of common stock | 0 |  |  |  |  |
Purchase of treasury shares | (16,414) |  | (16,408) |  | (6) |
Stock-based compensation | $ 2,812 |  | 2,812 |  |  |
Ending balance (in shares) at Jun. 30, 2019 | 28,008,959 | 30,591,472 |  |  |  |
Ending balance at Jun. 30, 2019 | $ 420,563 | $ 306 | $ 200,036 | $ 223,339 | $ (26) | $ (3,092)

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