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Revenue - Contract assets (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Revenue    
Unbilled revenue $ 317,880 $ 283,767
Retention receivable 134,189 124,990
Contract materials (not yet installed) 17,849 14,902
Contract assets 469,918 $ 423,659
Increase (decrease) in contract assets $ 46,300