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Subsequent Event	6 Months Ended
	Jun. 30, 2018
Subsequent Events [Abstract]
Subsequent Event	(15) SUBSEQUENT EVENT On July 15, 2018, the company and GulfMark Offshore, Inc. (“GulfMark”) entered into a definitive merger agreement to combine the two companies. Under the terms of the agreement, GulfMark stockholders will receive 1.1 shares of company common stock for each share of GulfMark common stock.  Each GulfMark noteholder warrant will be automatically converted into the right to receive 1.1 company shares, subject to Jones Act restrictions on maximum ownership of shares by non-U.S. citizens.  The company will assume GulfMark's obligations under existing GulfMark equity warrants. Upon completion of the proposed merger, the company’s and GulfMark’s stockholders will own approximately 74 percent and 26 percent, respectively, of the combined company. The proposed merger is expected to close in the fourth quarter of 2018, subject to regulatory and other customary closing conditions, including approval from the stockholders of the company and GulfMark. If the merger agreement is terminated under certain circumstances, the company may be obligated to pay GulfMark a termination fee of $35.0 million, and GulfMark may be obligated to pay the company a termination fee of $13.0 million.   On August 6, 2018, GulfMark issued a press release confirming receipt of a non-binding, unsolicited proposal from HGIM Corp. (“Harvey Gulf”) to combine the companies through a merger in which GulfMark would acquire Harvey Gulf, with the combined company remaining publicly listed and GulfMark stockholders owning 41.2% of the combined company.  According to GulfMark, its Board of Directors, with the assistance of outside financial and legal advisors, will review the Harvey Gulf unsolicited proposal.  In that same press release, the GulfMark Board of Directors confirmed its belief that, at the time of the release, the Tidewater merger is in the best interests of GulfMark's stockholders and continues to recommend that GulfMark stockholders adopt the merger agreement at the special meeting of GulfMark stockholders to be scheduled for this fall.

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- Definition

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://asc.fasb.org/topic&trid=2122774

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