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Consolidated Statements of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Common Stock Including Additional Paid in Capital [Member]
AOCI Attributable to Parent [Member]
Retained Earnings [Member]
Total
Balance (in shares) at Dec. 31, 2018 35,900      
Balance at Dec. 31, 2018 $ 279,353 $ (255) $ (237,700) $ 41,398
Net income (loss) 0 0 668,629 668,629
Foreign currency translation adjustment $ 0 149 0 149
Issuance of common stock, net of issuance cost (in shares) 4,848      
Issuance of common stock, net of issuance cost $ 38,062 0 0 38,062
Issuance of common stock under stock option plan (in shares) 771      
Issuance of common stock under stock option plan $ 3,835 0 0 3,835
Subscription receivable (102) 0 0 (102)
Collection of stock subscription receivable 302 0 0 302
Share-based compensation expense $ 3,358 0 0 3,358
Balance (in shares) at Dec. 31, 2019 41,519      
Balance at Dec. 31, 2019 $ 324,808 (106) 430,929 755,631
Net income (loss) 0 0 (11,221) (11,221)
Foreign currency translation adjustment $ 0 1,372 0 1,372
Issuance of common stock under stock option plan (in shares) 1,785      
Issuance of common stock under stock option plan $ 10,276 0 0 10,276
Share-based compensation expense $ 12,581 0 0 12,581
Tender offer (in shares) (14,000)      
Tender offer $ (97,860) 0 (322,140) (420,000)
Balance (in shares) at Dec. 31, 2020 29,304      
Balance at Dec. 31, 2020 $ 249,805 1,266 97,568 348,639
Net income (loss) 0 0 (17,414) (17,414)
Foreign currency translation adjustment $ 0 705 0 705
Issuance of common stock under stock option plan (in shares) 1,135      
Issuance of common stock under stock option plan $ 7,995 0 0 7,995
Share-based compensation expense 4,463 0 0 4,463
Dividends $ 0 0 (75,003) (75,003)
Balance (in shares) at Dec. 31, 2021 30,439      
Balance at Dec. 31, 2021 $ 262,263 $ 1,971 $ 5,151 $ 269,385