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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Retained Earnings | Accumulated Other Comprehensive Income (Lossses) | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Balance at beginning of period (in shares) at Dec. 31, 2019 |  | 53,473,620 |  |  |  |
Balance at beginning of period at Dec. 31, 2019 | $ 520,988 | $ 750 | $ 638,917 | $ 221,841 | $ (3,978) | $ (336,542)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) | (106,647) |  |  | (106,647) |  |
Foreign currency translation | (1,636) |  |  |  | (1,636) |
Stock-based compensation (in shares) |  | 141,223 |  |  |  |
Stock-based compensation | (917) | $ 3 | (920) |  |  |
Stock repurchase (in shares) |  | (766,122) |  |  |  |
Stock repurchase | (10,051) |  |  |  |  | (10,051)
Common stock dividends | (3,885) |  |  | (3,885) |  |
Unrealized gain (loss) on derivative instruments | (3,883) |  |  |  | (3,883) |
Balance at end of period (in shares) at Mar. 31, 2020 |  | 52,848,721 |  |  |  |
Balance at end of period at Mar. 31, 2020 | 393,969 | $ 753 | 637,997 | 111,309 | (9,497) | (346,593)
Balance at beginning of period (in shares) at Dec. 31, 2019 |  | 53,473,620 |  |  |  |
Balance at beginning of period at Dec. 31, 2019 | 520,988 | $ 750 | 638,917 | 221,841 | (3,978) | (336,542)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) | (106,793) |  |  |  |  |
Foreign currency translation | (1,318) |  |  |  |  |
Unrealized gain (loss) on derivative instruments | (1,619) |  |  |  |  |
Balance at end of period (in shares) at Jun. 30, 2020 |  | 52,906,115 |  |  |  |
Balance at end of period at Jun. 30, 2020 | 393,217 | $ 753 | 639,330 | 106,656 | (6,915) | (346,607)
Balance at beginning of period (in shares) at Mar. 31, 2020 |  | 52,848,721 |  |  |  |
Balance at beginning of period at Mar. 31, 2020 | 393,969 | $ 753 | 637,997 | 111,309 | (9,497) | (346,593)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) | (146) |  |  | (146) |  |
Foreign currency translation | 318 |  |  |  | 318 |
Stock-based compensation (in shares) |  | 57,394 |  |  |  |
Stock-based compensation | 1,333 |  | 1,333 |  |  |
Stock repurchase | (14) |  |  |  |  | (14)
Common stock dividends | (4,507) |  |  | (4,507) |  |
Unrealized gain (loss) on derivative instruments | 2,264 |  |  |  | 2,264 |
Balance at end of period (in shares) at Jun. 30, 2020 |  | 52,906,115 |  |  |  |
Balance at end of period at Jun. 30, 2020 | 393,217 | $ 753 | 639,330 | 106,656 | (6,915) | (346,607)
Balance at beginning of period (in shares) at Dec. 31, 2020 |  | 52,536,482 |  |  |  |
Balance at beginning of period at Dec. 31, 2020 | 404,879 | $ 755 | 644,695 | 107,233 | 7,633 | (355,437)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) | 3,217 |  |  | 3,217 |  |
Foreign currency translation | (303) |  |  |  | (303) |
Stock-based compensation (in shares) |  | 101,083 |  |  |  |
Stock-based compensation | 2,032 | $ 1 | 2,031 |  |  |
Stock repurchase (in shares) |  | (1,038,674) |  |  |  |
Stock repurchase | (19,321) |  |  |  |  | (19,321)
Common stock dividends | (3,967) |  |  | (3,967) |  |
Unrealized gain (loss) on derivative instruments | 14,530 |  |  |  | 14,530 |
Stock option exercises (in shares) |  | 112,400 |  |  |  |
Stock option exercises | 1,235 | $ 1 | 1,234 |  |  |
Balance at end of period (in shares) at Mar. 31, 2021 |  | 51,711,291 |  |  |  |
Balance at end of period at Mar. 31, 2021 | 402,302 | $ 757 | 647,960 | 106,483 | 21,860 | (374,758)
Balance at beginning of period (in shares) at Dec. 31, 2020 |  | 52,536,482 |  |  |  |
Balance at beginning of period at Dec. 31, 2020 | 404,879 | $ 755 | 644,695 | 107,233 | 7,633 | (355,437)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) | 15,469 |  |  |  |  |
Foreign currency translation | 364 |  |  |  |  |
Unrealized gain (loss) on derivative instruments | 23,161 |  |  |  |  |
Balance at end of period (in shares) at Jun. 30, 2021 |  | 50,464,034 |  |  |  |
Balance at end of period at Jun. 30, 2021 | 399,980 | $ 758 | 650,358 | 114,445 | 31,158 | (396,739)
Balance at beginning of period (in shares) at Mar. 31, 2021 |  | 51,711,291 |  |  |  |
Balance at beginning of period at Mar. 31, 2021 | 402,302 | $ 757 | 647,960 | 106,483 | 21,860 | (374,758)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) | 12,252 |  |  | 12,252 |  |
Foreign currency translation | 667 |  |  |  | 667 |
Stock-based compensation (in shares) |  | 37,147 |  |  |  |
Stock-based compensation | 2,184 | $ 1 | 2,183 |  |  |
Stock repurchase (in shares) |  | (1,304,214) |  |  |  |
Stock repurchase | (21,981) |  |  |  |  | (21,981)
Common stock dividends | (4,290) |  |  | (4,290) |  |
Unrealized gain (loss) on derivative instruments | 8,631 |  |  |  | 8,631 |
Stock option exercises (in shares) |  | 19,810 |  |  |  |
Stock option exercises | 215 |  | 215 |  |  |
Balance at end of period (in shares) at Jun. 30, 2021 |  | 50,464,034 |  |  |  |
Balance at end of period at Jun. 30, 2021 | $ 399,980 | $ 758 | $ 650,358 | $ 114,445 | $ 31,158 | $ (396,739)

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