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Consolidated 50% Owned Subsidiaries Consolidated 50% Owned Subsidiaries - Balance Sheet Information (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]      
Cash and cash equivalents $ 71,730   $ 94,095
Accounts receivable, including retainage 157,813   145,026
Other current assets 7,951   8,074
Total current assets 309,023   302,616
Property and equipment, net 49,217   51,999
Operating lease right-of-use assets 14,995 $ 13,600  
Goodwill 85,231   85,231
Total assets 499,895   482,573
Accounts payable 101,342   99,426
Other current liabilities 5,183   4,676
Total current liabilities 198,532   179,174
Other long-term liabilities 1,101   1,229
Total liabilities 325,202   310,313
Variable Interest Entity, Primary Beneficiary      
Schedule of Equity Method Investments [Line Items]      
Cash and cash equivalents 6,195   8,745
Accounts receivable, including retainage 27,011   24,109
Other current assets 14,959   14,533
Total current assets 48,165   47,387
Property and equipment, net 6,369   7,219
Operating lease right-of-use assets 3,232    
Goodwill 1,501   1,501
Total assets 59,267   56,107
Accounts payable 23,672   22,211
Other current liabilities 10,583   9,811
Total current liabilities 34,255   32,022
Other long-term liabilities 1,680   1,976
Total liabilities $ 35,935   $ 33,998