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CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS - Entity [Domain] - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jun. 30, 2015 | Jun. 30, 2014
Revenues: |  |  |
Vessel revenues |  | $ 298,313 | $ 381,510
Other operating revenues |  | 6,461 | 4,167
Total revenues |  | 304,774 | 385,677
Costs and expenses: |  |  |
Vessel operating costs |  | 179,281 | 217,244
Costs of other operating revenues |  | 5,744 | 4,661
General and administrative |  | 43,953 | 51,060
Vessel operating leases |  | 8,443 | 6,540
Depreciation and amortization |  | 45,657 | 43,111
(Gain)/loss on asset dispositions, net |  | 7,607 | (2,943)
Total costs and expenses |  | 290,685 | 319,673
Operating income |  | 14,089 | 66,004
Other income (expenses): |  |  |
Foreign exchange loss |  | (4,133) | (1,289)
Equity in net earnings/(losses) of unconsolidated companies |  | (2,441) | 5,283
Interest income and other, net |  | 790 | 622
Interest and other debt costs, net |  | (13,182) | (13,129)
Total other income (expenses) |  | (18,966) | (8,513)
Earnings (loss) before income taxes |  | (4,877) | 57,491
Income tax expense |  | 10,287 | 13,792
Net earnings (loss) |  | (15,164) | 43,699
Less: Net earnings (losses) attributable to noncontrolling interests |  | (112) | 26
Net earnings (loss) attributable to Tidewater Inc. |  | $ (15,052) | $ 43,673
Basic earnings (loss) attributable to Tidewater Inc. per common share | [1] | $ (0.32) | $ 0.88
Diluted earnings (loss) attributable to Tidewater Inc. per common share | [2] | $ (0.32) | $ 0.88
Weighted average common shares outstanding |  | 46,981,747 | 49,580,038
Dilutive effect of stock options and restricted stock |  |  | 282,986
Adjusted weighted average common shares |  | 46,981,747 | 49,863,024
[1] | The company calculates "earnings per share, basic" by dividing "net income available to common shareholders" by "Weighted average outstanding share of common stock, basic".
[2] | The company calculates "Earnings per share, diluted" by dividing "net income available to common shareholders" by "Weighted average common stock and equivalents".

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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