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Revenue (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Revenue From Contract With Customer [Line Items] |  |  |
Performance obligations exclude from dredging backlog | $ 50,000 |  |
Revenue, remaining performance obligation | $ 377,140 |  |
Percentage of performance obligation to be recognized as revenue | 100.00% |  |
Performance obligation, expected to be recognized as revenue year | 2023 |  |
Amortization on pre-contract and pre-construction costs | $ 11,148 | $ 17,839 |
Contract revenues | 648,781 | 726,149 | $ 733,601
Long-lived assets, net book value | 0 |  |
Increased gross profit | $ 22,276 |  |
Dredging [Member] | Use of Equipment [Member] | Federal Government [Member] |  |  |
Revenue From Contract With Customer [Line Items] |  |  |
Contract revenues |  | $ 716 |
Dredging [Member] | Sales [Member] | Geographic Concentration Risk [Member] | Middle East [Member] | Maximum [Member] |  |  |
Revenue From Contract With Customer [Line Items] |  |  |
Concentration risk percentage | 10.00% | 10.00% | 10.00%
Dredging [Member] | Sales [Member] | Federal Government Agencies [Member] | Customer Concentration Risk [Member] |  |  |
Revenue From Contract With Customer [Line Items] |  |  |
Concentration risk percentage | 67.00% | 78.00% | 80.00%
Dredging [Member] | Accounts Receivable [Member] | Geographic Concentration Risk [Member] | Middle East [Member] |  |  |
Revenue From Contract With Customer [Line Items] |  |  |
Concentration risk percentage | 9.00% | 9.00% |
Dredging [Member] | Accounts Receivable [Member] | Federal Government Agencies [Member] | Customer Concentration Risk [Member] |  |  |
Revenue From Contract With Customer [Line Items] |  |  |
Concentration risk percentage | 46.00% | 69.00% |
Other Current and Noncurrent Assets [Member] |  |  |
Revenue From Contract With Customer [Line Items] |  |  |
Costs to fulfill contracts with customers recognized as an asset | $ 4,472 | $ 5,652 |

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