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Consolidated 50% Owned Subsidiaries, including Variable Interest Entities ("VIE") - Balance sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current assets:        
Cash and cash equivalents $ 94,095 $ 83,953 $ 42,785 $ 4,426
Receivables, including retainage 145,026 133,931    
Other current assets 8,074 7,529    
Total current assets 302,616 278,526    
Property and equipment, net 51,999 54,406    
Goodwill 85,231 85,231    
Total assets 482,573 463,298    
Current liabilities:        
Accounts payable 99,426 97,457    
Total current liabilities 179,174 182,292    
Variable Interest Entity, Primary Beneficiary        
Current assets:        
Cash and cash equivalents 8,745 8,590    
Receivables, including retainage 24,109 26,844    
Other current assets 14,533 15,672    
Total current assets 47,387 51,106    
Property and equipment, net 7,219 9,001    
Goodwill 1,501 1,501    
Total assets 56,107 61,608    
Current liabilities:        
Accounts payable 22,211 28,448    
Other current liabilities 9,811 11,798    
Total current liabilities 32,022 40,246    
Long-term liabilities:        
Other long-term liabilities 1,976 3,491    
Total liabilities $ 33,998 $ 43,737