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Consolidated Statements of Equity - USD ($)
$ in Thousands
Gulf Mark Offshore Inc [Member]
Common Stock [Member]
Gulf Mark Offshore Inc [Member]
Additional Paid-in Capital [Member]
Gulf Mark Offshore Inc [Member]
Retained Earnings [Member]
Gulf Mark Offshore Inc [Member]
AOCI Attributable to Parent [Member]
Gulf Mark Offshore Inc [Member]
Noncontrolling Interest [Member]
Gulf Mark Offshore Inc [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Common Stock [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]
Noncontrolling Interest [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Noncontrolling Interest [Member]
Total
Balance at December 31 at Dec. 31, 2017                         $ 22 $ 1,059,120 $ (39,266) $ (147) $ 2,215 $ 1,021,944
Total comprehensive loss                         0 0 (171,517) 2,341 (254) (169,430)
Issuance of common stock from exercise of warrants                         6 (3) 0 0 0 3
Issuance of common stock for GulfMark business combination $ 9 $ 285,483 $ 0 $ 0 $ 0 $ 285,492                        
Amortization of restricted stock units                         0 8,914 0 0 0 8,914
Cash paid to noncontrolling interests                         0   0 0 (874) (2,000)
Cash paid to noncontrolling interests                           (1,126)        
Balance at December 31 at Dec. 31, 2018                         37 1,352,388 (210,783) 2,194 1,087 1,144,923
Total comprehensive loss                                   (143,649)
Issuance of common stock from exercise of warrants                         3 (3) 0 0 0 0
Amortization of restricted stock units                         0 15,136 0 0 0 15,136
Total comprehensive loss                         0 0 (141,743) (2,430) 524 (143,649)
Balance at December 31 at Dec. 31, 2019             $ 0 $ 0 $ (163) $ 0 $ 0 $ (163) 40 1,367,521 (352,526) (236) 1,611 1,016,410
Total comprehensive loss                                   (197,264)
Issuance of common stock from exercise of warrants                         1 (1) 0 0 0 0
Amortization of restricted stock units                         0 4,289 0 0 0 4,289
Total comprehensive loss                         0 0 (196,242) (568) (454) (197,264)
Balance at December 31 at Dec. 31, 2020                         $ 41 $ 1,371,809 $ (548,931) $ (804) $ 1,157 $ 823,272