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Construction Contract and Other Service Revenues (Construction Contract and Other Service Revenues by Compensation Arrangement) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Construction contract and other service revenues	$ 107,876	$ 70,640	$ 113,763
Construction
Disaggregation of Revenue [Line Items]
Construction contract and other service revenues	104,020	66,087	112,170
Design
Disaggregation of Revenue [Line Items]
Construction contract and other service revenues	2,250	2,343	612
Other
Disaggregation of Revenue [Line Items]
Construction contract and other service revenues	1,606	2,210	981
GMP
Disaggregation of Revenue [Line Items]
Construction contract and other service revenues	68,113	22,032	67,708
Cost-plus fee
Disaggregation of Revenue [Line Items]
Construction contract and other service revenues	24,260	34,025	34,386
FFP
Disaggregation of Revenue [Line Items]
Construction contract and other service revenues	13,897	12,373	10,688
Other
Disaggregation of Revenue [Line Items]
Construction contract and other service revenues	$ 1,606	$ 2,210	$ 981

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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