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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid In Capital | Treasury Stock | Accumulated Deficit | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2020 |  | 127,626 |  |  |  |
Beginning balance at Dec. 31, 2020 | $ 430,723 | $ 128 | $ 1,404,964 | $ (22,590) | $ (943,303) | $ (8,476)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Shares issued related to repurchase of stock (in shares) |  | 874 |  |  |  |
Shares issued related to repurchase of stock | (6,629) | $ 1 | (6,630) |  |  |
Shares issued to acquire assets and businesses (in shares) |  | 157 |  |  |  |
Shares issued to acquire assets and businesses | 3,500 |  | 3,500 |  |  |
Stock-based compensation expense | 18,162 |  | 18,162 |  |  |
Net (loss) income | 35,596 |  |  |  | 35,596 |
Unrealized loss on short-term investments | 0 |  |  |  |  |
Pension plan adjustments | 209 |  |  |  |  | 209
Termination of derivative instrument | 721 |  |  |  |  | 721
Retirement of treasury shares (in shares) |  | (1,861) |  |  |  |
Retirement of treasury shares | 0 | $ (2) | (12,096) | 12,098 |  |
Foreign currency translation adjustment | (15,743) |  |  |  |  | (15,743)
Ending balance (in shares) at Jun. 30, 2021 |  | 126,796 |  |  |  |
Ending balance at Jun. 30, 2021 | 466,539 | $ 127 | 1,407,900 | (10,492) | (907,707) | (23,289)
Beginning balance (in shares) at Mar. 31, 2021 |  | 126,484 |  |  |  |
Beginning balance at Mar. 31, 2021 | 462,133 | $ 126 | 1,397,276 | (10,492) | (898,075) | (26,702)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Shares issued related to net-share settlement of stock-based compensation (in shares) |  | 155 |  |  |  |
Shares issued related to net-share settlement of stock-based compensation | (3,880) | $ 1 | (3,881) |  |  |
Shares issued to acquire assets and businesses (in shares) |  | 157 |  |  |  |
Shares issued to acquire assets and businesses | 3,500 |  | 3,500 |  |  |
Stock-based compensation expense | 11,005 |  | 11,005 |  |  |
Net (loss) income | (9,632) |  |  |  | (9,632) |
Unrealized loss on short-term investments | 0 |  |  |  |  |
Pension plan adjustments | 28 |  |  |  |  | 28
Termination of derivative instrument | 0 |  |  |  |  |
Foreign currency translation adjustment | 3,385 |  |  |  |  | 3,385
Ending balance (in shares) at Jun. 30, 2021 |  | 126,796 |  |  |  |
Ending balance at Jun. 30, 2021 | $ 466,539 | $ 127 | 1,407,900 | (10,492) | (907,707) | (23,289)
Beginning balance (in shares) at Dec. 31, 2021 | 128,375 | 128,375 |  |  |  |
Beginning balance at Dec. 31, 2021 | $ 842,381 | $ 128 | 1,501,210 | 0 | (621,251) | (37,706)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Shares issued related to net-share settlement of stock-based compensation (in shares) |  | 1,929 |  |  |  |
Shares issued related to net-share settlement of stock-based compensation | (10,046) | $ 2 | (10,048) |  |  |
Stock-based compensation expense | 34,572 |  | 34,572 |  |  |
Net (loss) income | (59,760) |  |  |  | (59,760) |
Unrealized loss on short-term investments | (4,023) |  |  |  |  | (4,023)
Pension plan adjustments | 266 |  |  |  |  | 266
Termination of derivative instrument | 0 |  |  |  |  |
Foreign currency translation adjustment | $ (19,732) |  |  |  |  | (19,732)
Ending balance (in shares) at Jun. 30, 2022 | 130,304 | 130,304 |  |  |  |
Ending balance at Jun. 30, 2022 | $ 783,658 | $ 130 | 1,525,734 | 0 | (681,011) | (61,195)
Beginning balance (in shares) at Mar. 31, 2022 |  | 130,365 |  |  |  |
Beginning balance at Mar. 31, 2022 | 826,876 | $ 130 | 1,519,242 | 0 | (648,050) | (44,446)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Shares issued related to net-share settlement of stock-based compensation (in shares) |  | (61) |  |  |  |
Shares issued related to net-share settlement of stock-based compensation | (1,351) |  | (1,351) |  |  |
Stock-based compensation expense | 7,843 |  | 7,843 |  |  |
Net (loss) income | (32,961) |  |  |  | (32,961) |
Unrealized loss on short-term investments | (528) |  |  |  |  | (528)
Pension plan adjustments | 165 |  |  |  |  | 165
Termination of derivative instrument | 0 |  |  |  |  |
Foreign currency translation adjustment | $ (16,386) |  |  |  |  | (16,386)
Ending balance (in shares) at Jun. 30, 2022 | 130,304 | 130,304 |  |  |  |
Ending balance at Jun. 30, 2022 | $ 783,658 | $ 130 | $ 1,525,734 | $ 0 | $ (681,011) | $ (61,195)

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