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Consolidated 50% Owned Subsidiaries Consolidated 50% Owned Subsidiaries - Balance Sheet Information (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]          
Cash and cash equivalents $ 56,764   $ 94,095 $ 55,462 $ 83,953
Receivables, including retainage 147,001   145,026    
Other current assets 6,696   8,074    
Total current assets 268,918   302,616    
Property and equipment, net 52,011   51,999    
Operating lease right-of-use assets 15,290 $ 13,600      
Goodwill 85,231   85,231    
Total assets 463,514   482,573    
Accounts payable 81,870   99,426    
Other current liabilities 6,300   4,676    
Total current liabilities 162,010   179,174    
Other long-term liabilities 1,115   1,229    
Total liabilities 297,237   310,313    
Variable Interest Entity, Primary Beneficiary          
Schedule of Equity Method Investments [Line Items]          
Cash and cash equivalents 3,603   8,745    
Receivables, including retainage 24,900   24,109    
Other current assets 13,679   14,533    
Total current assets 42,182   47,387    
Property and equipment, net 6,818   7,219    
Operating lease right-of-use assets 3,297        
Goodwill 1,501   1,501    
Total assets 53,798   56,107    
Accounts payable 19,588   22,211    
Other current liabilities 11,032   9,811    
Total current liabilities 30,620   32,022    
Other long-term liabilities 1,854   1,976    
Total liabilities $ 32,474   $ 33,998