Commitments and Contingencies	12 Months Ended
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	17.Commitments and Contingencies The Company and one former and two current officers were named defendants in a class action lawsuit filed on April 11, 2019 in the United States District Court for the Southern District of Texas, Houston Division, seeking unstated compensatory damages under the federal securities laws allegedly arising from materially false and misleading statements during the period of March 13, 2018 to March 18, 2019. The complaint asserted, among other things, that the current and former officers caused the Company to overstate goodwill in certain periods; overstate accounts receivable; that the company lacked effective internal controls over financial reporting related to goodwill impairment testing and accounts receivable; and that as a result certain adjustments to goodwill and accounts receivable materially impacted the company’s financial statements, which in turn caused the company’s stock price to be artificially inflated during the class period. The District Court granted the Company’s Motion to Dismiss the Complaint on June 29, 2020 and the ruling became final on July 20, 2020 after no appeal was filed. On August 21, 2020, a Company dredge, the Waymon L. Boyd, was consumed by a fire while working on a project in the Port of Corpus Christi. Five crewmembers were killed, several more were injured, some seriously, and the vessel was declared a total loss. This incident also resulted in the discharge of approximately 18,000 gallons of oil, diesel fuel and contaminated water into the Corpus Christi Ship Channel, all of which was promptly cleaned up. The Company is fully cooperating with the U.S. Coast Guard, the Port of Corpus Christi Authority, and the National Transportation Safety Board, among others, while they investigate the cause of this incident. The National Transportation Safety Board has named the Company as a party of interest in their investigation. Thus far, eight separate lawsuits have been filed against the Company by certain crewmembers or their heirs under the general maritime law and the Jones Act. In response thereto, the Company has filed an action in the U.S. District Court for the Southern District of Texas seeking consolidation of the lawsuits for procedural purposes since they all arise out of the same occurrence and seeking exoneration from or limitation of liability relating to the foregoing incident as provided for in the federal rules of procedure for maritime claims. The Limitation Court set a deadline of February 17, 2021 by which all claims must be filed and as of the Court’s deadline, thirteen persons, estates and/or entities filed claims in the Limitation for personal injuries, death, property damages and business interruption, loss of profit, loss of use of natural resources and other economic damages for unspecified economic and compensatory damages. Some of these claimants may not have standing to bring their claims and will be challenged and, in any case, the Company will soon file a Default Motion with the Court which, upon approval, will bar the filing of any further claims. Applicable accounting guidance under ASC 450 would require the Company to recognize a loss if the loss is determined to be probable and reasonably estimable. However, this is a multi-party, complex tort proceeding, and it is too early in the proceedings for the Company to do so at this time. In any event, insurance coverage is available, the carriers of such insurance have taken over the costs of the defense of the claims and the Company currently believes that it has adequate insurance coverage for all pollution, marine, economic and other potential liabilities arising from the incident. The Company is also confident that it otherwise has adequate vessels, equipment and personnel to fulfill all ongoing, booked and reasonably foreseeable work. In addition, the Company is involved in various other legal and other proceedings which are incidental to the conduct of its business, none of which in the opinion of management will have a material effect on the Company’s financial condition, results of operations or cash flows. Management believes that it has recorded adequate accrued liabilities and believes that it has adequate insurance coverage or has meritorious defenses for these other claims and contingencies. A legal matter was settled in the Company’s favor for $5.5 million during the first quarter of 2018. Settlement amounts were recorded in Other gain from continuing operations in the Consolidated Statement of Operations, Prepaid expenses and other (current portion of the notes receivable) and Other non-current assets (non-current portion of the notes receivable) in the Consolidated Balance Sheets. As of December 31, 2020, the current portion of the notes receivable was $0.8 million and the non-current portion was $1.8 million, net of $0.2 million of unamortized discount. Legal fees related to this matter were expensed as incurred during the respective reporting period. During the quarter ended September 30, 2020, the Company settled a long-standing dispute with a customer that resulted in recovery of $0.9 million of previously reserved accounts receivable.

Commitments and Contingencies

12 Months Ended

Dec. 31, 2020

Commitments and Contingencies Disclosure [Abstract]

17.Commitments and Contingencies

The Company and one former and two current officers were named defendants in a class action lawsuit filed on April 11, 2019 in the United States District Court for the Southern District of Texas, Houston Division, seeking unstated compensatory damages under the federal securities laws allegedly arising from materially false and misleading statements during the period of March 13, 2018 to March 18, 2019. The complaint asserted, among other things, that the current and former officers caused the Company to overstate goodwill in certain periods; overstate accounts receivable; that the company lacked effective internal controls over financial reporting related to goodwill impairment testing and accounts receivable; and that as a result certain adjustments to goodwill and accounts receivable materially impacted the company’s financial statements, which in turn caused the company’s stock price to be artificially inflated during the class period. The District Court granted the Company’s Motion to Dismiss the Complaint on June 29, 2020 and the ruling became final on July 20, 2020 after no appeal was filed.

On August 21, 2020, a Company dredge, the Waymon L. Boyd, was consumed by a fire while working on a project in the Port of Corpus Christi. Five crewmembers were killed, several more were injured, some seriously, and the vessel was declared a total loss. This incident also resulted in the discharge of approximately 18,000 gallons of oil, diesel fuel and contaminated water into the Corpus Christi Ship Channel, all of which was promptly cleaned up. The Company is fully cooperating with the U.S. Coast Guard, the Port of Corpus Christi Authority, and the National Transportation Safety Board, among others, while they investigate the cause of this incident. The National Transportation Safety Board has named the

Company as a party of interest in their investigation. Thus far, eight separate lawsuits have been filed against the Company by certain crewmembers or their heirs under the general maritime law and the Jones Act. In response thereto, the Company has filed an action in the U.S. District Court for the Southern District of Texas seeking consolidation of the lawsuits for procedural purposes since they all arise out of the same occurrence and seeking exoneration from or limitation of liability relating to the foregoing incident as provided for in the federal rules of procedure for maritime claims. The Limitation Court set a deadline of February 17, 2021 by which all claims must be filed and as of the Court’s deadline, thirteen persons, estates and/or entities filed claims in the Limitation for personal injuries, death, property damages and business interruption, loss of profit, loss of use of natural resources and other economic damages for unspecified economic and compensatory damages. Some of these claimants may not have standing to bring their claims and will be challenged and, in any case, the Company will soon file a Default Motion with the Court which, upon approval, will bar the filing of any further claims. Applicable accounting guidance under ASC 450 would require the Company to recognize a loss if the loss is determined to be probable and reasonably estimable. However, this is a multi-party, complex tort proceeding, and it is too early in the proceedings for the Company to do so at this time. In any event, insurance coverage is available, the carriers of such insurance have taken over the costs of the defense of the claims and the Company currently believes that it has adequate insurance coverage for all pollution, marine, economic and other potential liabilities arising from the incident. The Company is also confident that it otherwise has adequate vessels, equipment and personnel to fulfill all ongoing, booked and reasonably foreseeable work.

In addition, the Company is involved in various other legal and other proceedings which are incidental to the conduct of its business, none of which in the opinion of management will have a material effect on the Company’s financial condition, results of operations or cash flows. Management believes that it has recorded adequate accrued liabilities and believes that it has adequate insurance coverage or has meritorious defenses for these other claims and contingencies.

A legal matter was settled in the Company’s favor for $5.5 million during the first quarter of 2018. Settlement amounts were recorded in Other gain from continuing operations in the Consolidated Statement of Operations, Prepaid expenses and other (current portion of the notes receivable) and Other non-current assets (non-current portion of the notes receivable) in the Consolidated Balance Sheets. As of December 31, 2020, the current portion of the notes receivable was $0.8 million and the non-current portion was $1.8 million, net of $0.2 million of unamortized discount. Legal fees related to this matter were expensed as incurred during the respective reporting period.

During the quarter ended September 30, 2020, the Company settled a long-standing dispute with a customer that resulted in recovery of $0.9 million of previously reserved accounts receivable.