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Revenue - Schedule of Construction Services Contracts Receivable (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]    
Billed on completed contracts and contracts in progress $ 235,971 $ 216,268
Other receivables 5,389 8,456
Contracts receivable, gross 241,360 224,724
Allowance for doubtful accounts (443) (820)
Contracts receivable, net $ 240,917 $ 223,904