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Consolidated 50% Owned Subsidiaries Consolidated 50% Owned Subsidiaries - Balance Sheet Information (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]      
Cash and cash equivalents $ 76,530   $ 94,095
Accounts receivable, including retainage 160,512   145,026
Other current assets 11,065   8,074
Total current assets 332,746   302,616
Property and equipment, net 48,584   51,999
Operating lease right-of-use assets 14,589 $ 13,600  
Goodwill 85,231   85,231
Total assets 521,969   482,573
Accounts payable 110,624   99,426
Other current liabilities 6,982   4,676
Total current liabilities 213,659   179,174
Other long-term liabilities 1,088   1,229
Total liabilities 338,710   310,313
Variable Interest Entity, Primary Beneficiary      
Schedule of Equity Method Investments [Line Items]      
Cash and cash equivalents 11,202   8,745
Accounts receivable, including retainage 24,314   24,109
Other current assets 15,079   14,533
Total current assets 50,595   47,387
Property and equipment, net 6,008   7,219
Operating lease right-of-use assets 3,020    
Goodwill 1,501   1,501
Total assets 61,124   56,107
Accounts payable 21,869   22,211
Other current liabilities 15,459   9,811
Total current liabilities 37,328   32,022
Other long-term liabilities 1,123   1,976
Total liabilities $ 38,451   $ 33,998