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Consolidated Statements of Equity - USD ($)
$ in Thousands
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive (Loss) Income
Accumulated Deficit
Total
Balance at the beginning at Dec. 31, 2019 $ 417 $ 1,721,268   $ (743,257) $ 978,428
Increase (Decrease) in Shareholders' Equity          
Net income (loss)       (120,350) (120,350)
Issuance of shares due to vesting of RSUs, net of forfeitures 1 (1)      
Cash dividends declared   (7,363)     (7,363)
Nonvested stock amortization   481     481
Balance at the end at Mar. 31, 2020 418 1,714,385   (863,607) 851,196
Balance at the beginning at Dec. 31, 2019 417 1,721,268   (743,257) 978,428
Increase (Decrease) in Shareholders' Equity          
Net income (loss)         (159,652)
Other comprehensive (loss) income         0
Balance at the end at Sep. 30, 2020 418 1,713,711   (902,909) 811,220
Balance at the beginning at Mar. 31, 2020 418 1,714,385   (863,607) 851,196
Increase (Decrease) in Shareholders' Equity          
Net income (loss)       (18,204) (18,204)
Cash dividends declared   (842)     (842)
Nonvested stock amortization   476     476
Balance at the end at Jun. 30, 2020 418 1,714,019   (881,811) 832,626
Increase (Decrease) in Shareholders' Equity          
Net income (loss)       (21,098) (21,098)
Other comprehensive (loss) income         0
Cash dividends declared   (842)     (842)
Nonvested stock amortization   534     534
Balance at the end at Sep. 30, 2020 418 1,713,711   (902,909) 811,220
Balance at the beginning at Dec. 31, 2020 418 1,713,406   (968,830) 744,994
Increase (Decrease) in Shareholders' Equity          
Net income (loss)       1,985 1,985
Other comprehensive (loss) income     $ 161   161
Issuance of shares due to vesting of RSUs and exercise of options 1 (1)      
Cash dividends declared   (845)     (845)
Nonvested stock amortization   522     522
Balance at the end at Mar. 31, 2021 419 1,713,082 161 (966,845) 746,817
Balance at the beginning at Dec. 31, 2020 418 1,713,406   (968,830) 744,994
Increase (Decrease) in Shareholders' Equity          
Net income (loss)         91,154
Other comprehensive (loss) income         40
Balance at the end at Sep. 30, 2021 419 1,707,900 40 (877,676) 830,683
Balance at the beginning at Mar. 31, 2021 419 1,713,082 161 (966,845) 746,817
Increase (Decrease) in Shareholders' Equity          
Net income (loss)       32,037 32,037
Other comprehensive (loss) income     (23)   (23)
Cash dividends declared   (2,110)     (2,110)
Nonvested stock amortization   551     551
Balance at the end at Jun. 30, 2021 419 1,711,523 138 (934,808) 777,272
Increase (Decrease) in Shareholders' Equity          
Net income (loss)       57,132 57,132
Other comprehensive (loss) income     (98)   (98)
Cash dividends declared   (4,220)     (4,220)
Nonvested stock amortization   597     597
Balance at the end at Sep. 30, 2021 $ 419 $ 1,707,900 $ 40 $ (877,676) $ 830,683