Commitments and Contingencies	12 Months Ended
Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	17.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 has fully cooperated with the U.S. Coast Guard, the Port of Corpus Christi Authority, and the National Transportation Safety Board, among others, while they investigated the cause of this incident. The National Transportation Safety Board named the Company as a party of interest in their investigation. A total of eight separate lawsuits were filed against the Company by certain crewmembers or their heirs under the general maritime law and the Jones Act. In response thereto, the Company filed an action in the U.S. District Court for the Southern District of Texas that requested consolidation of the lawsuits for procedural purposes since they all arose out of the same occurrence and sought 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 were required to 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. The Company then filed a Default Motion with the Court which was granted on April 8, 2021 that barred the filing of any further claims. Applicable accounting guidance under ASC 450 required the Company to recognize a loss if the loss is determined to be probable and reasonably estimable. As of December 31, 2021, we have recognized $206.7 million in total liabilities with respect to this incident, which includes approximately $192.0 million paid by the Company to date (including full settlements with 17 of the 18 crewmembers and wreck removal costs), and accruals totaling approximately $14.6 million for outstanding claims. Since the end of the year the remaining crewmember claim has been settled, funded, and reimbursed, and the remaining property damages claim has settled, with funding and reimbursement pending. Thus, all claims arising from the August 21, 2020 incident have been settled within insurance coverage limits, the carriers of such insurance have reimbursed the Company $189.6 million, to date, and the Company remains 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 December 31, 2021, the current portion of the notes receivable was $0.8 million and the non-current portion was $1.1 million, net of $0.1 million of unamortized discount. Legal fees related to this matter were expensed as incurred during the respective reporting period.

Commitments and Contingencies

12 Months Ended

Dec. 31, 2021

Commitments and Contingencies Disclosure [Abstract]

17.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 has fully cooperated with the U.S. Coast Guard, the Port of Corpus Christi Authority, and the National Transportation Safety Board, among others, while they investigated the cause of this incident. The National Transportation Safety Board named the Company as a party of interest in their investigation. A total of eight separate lawsuits were filed against the Company by certain crewmembers or their heirs under the general maritime law and the Jones Act. In response thereto, the Company filed an action in the U.S. District Court for the Southern District of Texas that requested consolidation of the lawsuits for procedural purposes since they all arose out of the same occurrence and sought 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 were required to 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. The Company then filed a Default Motion with the Court which was granted on April 8, 2021 that barred the filing of any further claims. Applicable accounting guidance under ASC 450 required the Company to recognize a loss if the loss is determined to be probable and reasonably estimable. As of December 31, 2021, we have recognized $206.7 million in total liabilities with respect to this incident, which includes approximately $192.0 million paid by the Company to date (including full settlements with 17 of the 18 crewmembers and wreck removal costs), and accruals totaling approximately $14.6 million for outstanding claims. Since the end of the year the remaining crewmember claim has been settled, funded, and reimbursed, and the remaining property damages claim has settled, with funding and reimbursement pending. Thus, all claims arising from the August 21, 2020 incident have been settled within insurance coverage limits, the carriers of such insurance have reimbursed the Company $189.6 million, to date, and the Company remains 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 December 31, 2021, the current portion of the notes receivable was $0.8 million and the non-current portion was $1.1 million, net of $0.1 million of unamortized discount. Legal fees related to this matter were expensed as incurred during the respective reporting period.