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Commitments And Contingencies (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Current Fiscal Year End Date --12-31    
Lessee, Operating Lease, Liability, Payments, Due 2021 $ 3.5    
Lessee, Operating Lease, Liability, Payments, Due 2022 3.1    
Lessee, Operating Lease, Liability, Payments, Due 2023 3.0    
Lessee, Operating Lease, Liability, Payments, Due 2024 2.8    
Lessee, Operating Lease, Liability, Payments, Due 2024 2.0    
Lessee, Operating Lease, Liability, Payments, Due Thereafter 0.1    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount $ 1.5    
Number of Operating properties Acquired   4  
Number of consolidated projects under construction 7    
Anticipated expenditures relating to completion of construction type contracts $ 325.4    
Earnest Money Deposits 1.4    
Operating Lease, Right-of-Use Asset 9.2 $ 10.6  
Rent expense related to operating lease liabilities 3.0 2.9  
Variable Lease, Cost 1.3 1.4  
Cash flows from operating leases $ 3.3 $ 3.1  
Operating Lease, Weighted Average Remaining Lease Term 4 years 4 months 24 days 5 years 3 months 18 days  
Operating Lease, Weighted Average Discount Rate, Percent 4.80% 4.90%  
Rental expense $ 4.3 $ 4.3 $ 3.8
Operating Leases, Future Minimum Payments Due, Next Twelve Months   2.9  
Operating Leases, Future Minimum Payments, Due in Two Years   3.0  
Operating Leases, Future Minimum Payments, Due in Three Years   3.1  
Operating Leases, Future Minimum Payments, Due in Four Years   2.7  
Operating Leases, Future Minimum Payments, Due in Five Years   2.6  
Operating Leases, Future Minimum Payments, Due Thereafter   $ 4.5  
Earnest money deposits, non-refundable $ 0.8    
Other Assets      
Operating Lease, Liability us-gaap:OtherLiabilities    
Partnership Interest [Member] | Maximum [Member]      
Less than joint venture economic interest noted 100.00%