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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Cumulative Effect, Period of Adoption, Adjustment [Member]
Common Stock Outstanding [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Additional Paid-in Capital [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Retained Earnings [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
AOCI Attributable to Parent [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Treasury Stock [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Common Stock Outstanding [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Treasury Stock [Member]
Total
Balance (in shares) at Dec. 31, 2019 0           37,585          
Balance at Dec. 31, 2019 $ 0 $ 0 $ (321) $ 0 $ 0 $ (321) $ 2,846 $ 1,075,809 $ (220,805) $ (30,298) $ (17,258) $ 810,294
Net loss             0 0 (85,978) 0 0 (85,978)
Foreign currency translation adjustments             0 0 0 424 0 424
Equity-based compensation expense             $ 0 2,146 0 0 0 2,146
Common shares issued upon vesting of share-based awards (in shares)             156          
Common shares issued upon vesting of share-based awards             $ 10 (10) 0 0 0 0
Common shares issued for employee stock purchase plan (in shares)             21          
Common shares issued for employee stock purchase plan             $ 1 551 0 0 0 552
Treasury shares withheld (in shares)             (49)          
Treasury shares withheld             $ 0 0 0 0 (1,056) (1,056)
Share repurchase program (in shares)             (62)          
Share repurchase program             $ 0 0 0 0 (1,017) (1,017)
Balance (in shares) at Mar. 31, 2020             37,651          
Balance at Mar. 31, 2020             $ 2,857 1,078,496 (307,104) (29,874) (19,331) 725,044
Balance (in shares) at Dec. 31, 2019 0           37,585          
Balance at Dec. 31, 2019 $ 0 $ 0 $ (321) $ 0 $ 0 $ (321) $ 2,846 1,075,809 (220,805) (30,298) (17,258) 810,294
Net loss                       (148,014)
Foreign currency translation adjustments                       (262)
Balance (in shares) at Sep. 30, 2020             37,696          
Balance at Sep. 30, 2020             $ 2,863 1,085,160 (369,140) (30,560) (19,880) 668,443
Balance (in shares) at Mar. 31, 2020             37,651          
Balance at Mar. 31, 2020             $ 2,857 1,078,496 (307,104) (29,874) (19,331) 725,044
Net loss             0 0 (34,245) 0 0 (34,245)
Foreign currency translation adjustments             0 0 0 (139) 0 (139)
Equity-based compensation expense             0 3,515 0 0 0 3,515
Common shares issued for employee stock purchase plan             $ 3 (3) 0 0 0 0
Treasury shares withheld (in shares)             (2)          
Treasury shares withheld             $ 0 0 0 0 (31) (31)
Share repurchase program (in shares)             (32)          
Share repurchase program             $ 0 0 0 0 (480) (480)
Balance (in shares) at Jun. 30, 2020             37,655          
Balance at Jun. 30, 2020             $ 2,860 1,082,008 (341,349) (30,013) (19,842) 693,664
Net loss             0 0 (27,791) 0 0 (27,791)
Foreign currency translation adjustments             0 0 0 (547) 0 (547)
Equity-based compensation expense             $ 0 2,773 0 0 0 2,773
Common shares issued upon vesting of share-based awards (in shares)             9          
Common shares issued upon vesting of share-based awards             $ 1 (1) 0 0 0 0
Common shares issued for employee stock purchase plan (in shares)             35          
Common shares issued for employee stock purchase plan             $ 2 380 0 0 0 382
Treasury shares withheld (in shares)             (3)          
Treasury shares withheld             $ 0 0 0 0 (38) (38)
Balance (in shares) at Sep. 30, 2020             37,696          
Balance at Sep. 30, 2020             $ 2,863 1,085,160 (369,140) (30,560) (19,880) 668,443
Balance (in shares) at Dec. 31, 2020             37,721          
Balance at Dec. 31, 2020             $ 2,866 1,087,733 (377,346) (31,966) (20,038) 661,249
Net loss             0 0 (23,886) 0 0 (23,886)
Foreign currency translation adjustments             0 0 0 1,716 0 1,716
Equity-based compensation expense             $ 0 2,872 0 0 0 2,872
Common shares issued upon vesting of share-based awards (in shares)             286          
Common shares issued upon vesting of share-based awards             $ 21 (21) 0 0 0 0
Common shares issued for employee stock purchase plan (in shares)             39          
Common shares issued for employee stock purchase plan             $ 3 444 0 0 0 447
Treasury shares withheld (in shares)             (94)          
Treasury shares withheld             $ 0 0 0 0 (1,900) (1,900)
Balance (in shares) at Mar. 31, 2021             37,952          
Balance at Mar. 31, 2021             $ 2,890 1,091,028 (401,232) (30,250) (21,938) 640,498
Balance (in shares) at Dec. 31, 2020             37,721          
Balance at Dec. 31, 2020             $ 2,866 1,087,733 (377,346) (31,966) (20,038) 661,249
Net loss                       (51,583)
Foreign currency translation adjustments                       3,169
Balance (in shares) at Sep. 30, 2021             38,066          
Balance at Sep. 30, 2021             $ 2,900 1,098,236 (428,930) (28,798) (21,968) 621,440
Balance (in shares) at Mar. 31, 2021             37,952          
Balance at Mar. 31, 2021             $ 2,890 1,091,028 (401,232) (30,250) (21,938) 640,498
Net loss             0 0 (12,617) 0 0 (12,617)
Foreign currency translation adjustments             0 0 0 (134) 0 (134)
Equity-based compensation expense             $ 0 3,425 0 0 0 3,425
Common shares issued upon vesting of share-based awards (in shares)             80          
Common shares issued for employee stock purchase plan             $ 6 (6) 0 0 0 0
Treasury shares withheld (in shares)             (1)          
Treasury shares withheld             $ 0 0 0 0 (30) (30)
Balance (in shares) at Jun. 30, 2021             38,031          
Balance at Jun. 30, 2021             $ 2,896 1,094,447 (413,849) (30,384) (21,968) 631,142
Net loss             0 0 (15,081) 0 0 (15,081)
Foreign currency translation adjustments             0 0 0 1,586 0 1,586
Equity-based compensation expense             $ 0 3,307 0 0 0 3,307
Common shares issued for employee stock purchase plan (in shares)             35          
Common shares issued for employee stock purchase plan             $ 4 482 0 0 0 486
Balance (in shares) at Sep. 30, 2021             38,066          
Balance at Sep. 30, 2021             $ 2,900 $ 1,098,236 $ (428,930) $ (28,798) $ (21,968) $ 621,440