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CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS (LOSS) - USD ($) $ in Thousands | 3 Months Ended | 4 Months Ended | 5 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jul. 31, 2017 | Dec. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Mar. 31, 2017
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 105,601 |  |  |  |  |  | $ 178,753 |  | $ 197,094 |  |  |  |  |
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vessel operating costs | 68,012 |  |  |  |  |  | 120,502 |  | 129,376 |  |  |  |  |
Costs of other operating revenues | 642 |  |  |  |  |  | 3,792 |  | 3,116 |  |  |  |  |
General and administrative | 24,425 |  |  |  |  |  | 46,619 |  | 47,990 |  |  |  |  |
Vessel operating leases |  |  |  |  |  |  | 1,215 |  |  |  |  |  |  |
Depreciation and amortization | 12,785 |  |  |  |  |  | 20,337 |  | 24,802 |  |  |  |  |
Gain on asset dispositions, net | (1,338) |  |  |  |  |  | (6,616) |  | (3,257) |  |  |  |  |
Asset impairments | 1,215 | [1] |  |  |  |  | 16,777 | [2] | 7,401 | [1] |  |  |  |
Total costs and expenses | 105,741 |  |  |  |  |  | 202,626 |  | 209,428 |  |  |  |  |
Operating loss | (140) |  |  |  |  |  | (23,873) |  | (12,334) |  |  |  |  |
Other income (expenses): |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign exchange loss | (1,002) |  |  |  |  |  | (407) |  | (1,350) |  |  |  |  |
Equity in net earnings (losses) of unconsolidated companies | 390 |  |  |  |  |  | 2,130 |  | (15,049) |  |  |  |  |
Interest income and other, net | 2,914 |  |  |  |  |  | 2,771 |  | 2,786 |  |  |  |  |
Reorganization items |  |  |  |  |  |  | (4,299) |  |  |  |  |  |  |
Interest and other debt costs, net | (7,547) |  |  |  |  |  | (13,009) |  | (15,146) |  |  |  |  |
Total other income (expenses) | (5,245) |  |  |  |  |  | (12,814) |  | (28,759) |  |  |  |  |
Loss before income taxes | (5,385) |  |  |  |  |  | (36,687) |  | (41,093) |  |  |  |  |
Income tax (benefit) expense | 5,797 |  |  |  |  |  | 2,039 |  | 9,118 |  |  |  |  |
Net loss | (11,182) |  |  |  |  |  | (38,726) |  | (50,211) |  |  |  |  |
Less: Net income (loss) attributable to noncontrolling interests | (242) |  |  |  |  |  | 540 |  | (99) |  |  |  |  |
Net loss attributable to Tidewater Inc. | $ (10,940) |  |  |  |  |  | $ (39,266) |  | $ (50,112) |  |  |  |  |
Basic loss per common share | $ (0.44) | [3] |  |  |  |  | $ (1.82) | [4] | $ (2.09) | [3] |  |  |  |
Diluted loss per common share | $ (0.44) | [5] |  |  |  |  | $ (1.82) | [6] | $ (2.09) | [5] |  |  |  |
Weighted average common shares outstanding | 24,654,220 | [7] |  |  |  |  | 21,539,143 | [8] | 23,989,254 | [7] |  |  |  |
Dilutive effect of stock options and restricted stock | 0 |  |  |  |  |  | 0 |  | 0 |  |  |  |  |
Adjusted weighted average common shares | 24,654,220 |  |  |  |  |  | 21,539,143 |  | 23,989,254 |  |  |  |  |
Vessel Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 104,174 |  |  |  |  |  | $ 171,884 |  | $ 191,668 |  |  |  |  |
Other Operating Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 1,427 | [9] |  |  |  |  | $ 6,869 |  | $ 5,426 | [9] |  |  |  |
Predecessor |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  | $ 115,106 |  | $ 151,369 |  |  |  |  |  | $ 275,855 |  | $ 601,611 |
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vessel operating costs |  |  | 83,773 |  | 116,438 |  |  |  |  |  | 164,618 |  | 359,171 |
Costs of other operating revenues |  |  | 1,585 |  | 2,348 |  |  |  |  |  | 4,274 |  | 12,729 |
General and administrative |  |  | 33,059 |  | 41,832 |  |  |  |  |  | 74,786 |  | 145,879 |
Vessel operating leases |  |  | 5,542 |  | 6,165 |  |  |  |  |  | 13,985 |  | 33,766 |
Depreciation and amortization |  |  | 36,287 |  | 47,447 |  |  |  |  |  | 73,879 |  | 167,291 |
Gain on asset dispositions, net |  |  | (3,189) |  | (3,561) |  |  |  |  |  | (9,253) |  | (24,099) |
Asset impairments |  |  | 163,423 | [1] | 184,748 | [2] |  |  |  |  | 228,280 | [1] | 484,727 | [2]
Total costs and expenses |  |  | 320,480 |  | 395,417 |  |  |  |  |  | 550,569 |  | 1,179,464 |
Operating loss |  |  | (205,374) | [10] | (244,048) |  |  |  |  |  | (274,714) |  | (577,853) |
Other income (expenses): |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign exchange loss |  |  | (1,157) |  | (3,181) |  |  |  |  |  | (493) |  | (1,638) |
Equity in net earnings (losses) of unconsolidated companies |  |  | 4,517 |  | 4,786 |  |  |  |  |  | 7,358 |  | 5,710 |
Interest income and other, net |  |  | 1,680 |  | 2,384 |  |  |  |  |  | 3,268 |  | 5,193 |
Reorganization items |  |  | (313,176) |  | (1,396,905) |  |  |  |  |  | (313,176) |  |  |
Interest and other debt costs, net |  |  | (10,605) |  | (11,179) |  |  |  |  |  | (31,613) |  | (75,026) |
Total other income (expenses) |  |  | (318,741) |  | (1,404,095) |  |  |  |  |  | (334,656) |  | (65,761) |
Loss before income taxes |  |  | (524,115) |  | (1,648,143) |  |  |  |  |  | (609,370) |  | (643,614) |
Income tax (benefit) expense |  |  | 295 |  | (1,234) |  |  |  |  |  | 2,012 |  | 6,397 |
Net loss |  |  | (524,410) |  | (1,646,909) |  |  |  |  |  | (611,382) |  | (650,011) |
Less: Net income (loss) attributable to noncontrolling interests |  |  | 24 |  |  |  |  |  |  |  | 7,907 |  | 10,107 |
Net loss attributable to Tidewater Inc. |  |  | $ (524,434) |  | $ (1,646,909) |  |  |  |  |  | $ (619,289) |  | $ (660,118) |
Basic loss per common share |  |  | $ (11.13) | [3] | $ (34.95) | [4] |  |  |  |  | $ (13.15) | [3] | $ (14.02) | [4]
Diluted loss per common share |  |  | $ (11.13) | [5] | $ (34.95) | [6] |  |  |  |  | $ (13.15) | [5] | $ (14.02) | [6]
Weighted average common shares outstanding |  |  | 47,121,304 | [7] | 47,121,330 | [8] |  |  |  |  | 47,101,155 | [7] | 47,071,066 | [8]
Dilutive effect of stock options and restricted stock |  |  | 0 |  | 0 |  |  |  |  |  | 0 |  | 0 |
Adjusted weighted average common shares |  |  | 47,121,304 |  | 47,121,330 |  |  |  |  |  | 47,101,155 |  | 47,071,066 |
Predecessor | Vessel Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  | $ 112,257 |  | $ 146,597 |  |  |  |  |  | $ 269,162 |  | $ 583,816 |
Predecessor | Other Operating Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  | $ 2,849 | [9] | $ 4,772 |  |  |  |  |  | $ 6,693 | [9] | $ 17,795 |
[1] | Refer to Note (14) for additional information regarding asset impairment.
[2] | The period August 1, 2017 through December 31, 2017 and the year ended March 31, 2017 included $2.3 million and $2.2 million, respectively, of impairments related to inventory and other non-vessel assets.
[3] | Tidewater calculates "Loss per share, basic" by dividing "Net loss available to common shareholders" by "Weighted average outstanding shares of common stock, basic".
[4] | The Company calculates "Loss per share, basic" by dividing "Net loss available to common shareholders" by "Weighted average outstanding share of common stock, basic".
[5] | Tidewater calculates "Loss per share, diluted" by dividing "Net loss available to common shareholders" by "Weighted average common stock and equivalents".
[6] | The Company calculates "Loss per share, diluted" by dividing "Net loss available to common shareholders" by "Weighted average common stock and equivalents".
[7] | Common shares and new creditor warrants and the sum of common shares and New Creditor Warrants outstanding at June 30, 2018, were 26,085,274, 3,924,441 and 30,009,715, respectively.
[8] | Basic weighted average shares outstanding includes 924,125 shares issuable upon the exercise of New Creditor Warrants held by U.S. citizens at December 31, 2017 (Successor).
[9] | Included in other operating revenues for the quarter and six months ended June 30, 2017, were $0.5 million and $0.8 million, respectively, of revenues related to the company's subsea business. The eight ROVs representing substantially all of the company's subsea assets were sold in December 2017.
[10] | Operating income consists of revenues less operating costs and expenses, depreciation, vessel operating leases, goodwill impairment, restructuring charges, asset impairments, general and administrative expenses and gain on asset dispositions, net, of Tidewater's operations. Asset impairments, net, are as follows:

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