Commitments and Contingencies	3 Months Ended
Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	16.Commitments and Contingencies 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. Further, the Company filed a Default Motion with the Court which was granted on April 8, 2021 and as such bars 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. As at March 31, 2021, the Company has recognized $72.2 million in total obligations to date, which includes approximately $18.0 million paid to date to claimants (including nine of 18 crewmembers) and accruals totaling approximately $54.2 million. However, this is a multi-party, complex tort proceeding, and it is too early in the proceedings for the Company to establish loss accruals in regard to the balance of the claims. In any event, insurance coverage is available and the carriers of such insurance have taken over the costs of the defense of the claims and have reimbursed the Company $17.1 million to date. In addition, the Company continues to believe 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 Condensed 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 Condensed Consolidated Balance Sheets. As of March 31, 2021, the current portion of the notes receivable was $0.8 million and the non-current portion was $1.6 million, net of $0.2 million of unamortized discount. Legal fees related to this matter were expensed as incurred during the respective reporting period.

Commitments and Contingencies

3 Months Ended

Mar. 31, 2021

Commitments and Contingencies Disclosure [Abstract]

16.Commitments and Contingencies

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. Further, the Company filed a Default Motion with the Court which was granted on April 8, 2021 and as such bars 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. As at March 31, 2021, the Company has recognized $72.2 million in total obligations to date, which includes approximately $18.0 million paid to date to claimants (including nine of 18 crewmembers) and accruals totaling approximately $54.2 million. However, this is a multi-party, complex tort proceeding, and it is too early in the proceedings for the Company to establish loss accruals in regard to the balance of the claims. In any event, insurance coverage is available and the carriers of such insurance have taken over the costs of the defense of the claims and have reimbursed the Company $17.1 million to date. In addition, the Company continues to believe 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 Condensed 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 Condensed Consolidated Balance Sheets. As of March 31, 2021, the current portion of the notes receivable was $0.8 million and the non-current portion was $1.6 million, net of $0.2 million of unamortized discount. Legal fees related to this matter were expensed as incurred during the respective reporting period.