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Consolidated 50% Owned Subsidiaries, including Variable Interest Entities ("VIE") Consolidated 50% Owned Subsidiaries, including Variable Interest Entities ("VIE") - Balance Sheet Information (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |  |
Cash and cash equivalents | $ 89,336 | $ 83,953 | $ 66,541 | $ 42,785
Receivables, including retainage | 160,247 | 133,931 |  |
Other current assets | 8,857 | 7,529 |  |
Total current assets | 313,376 | 278,526 |  |
Property and equipment, net | 52,196 | 54,406 |  |
Goodwill | 85,231 | 85,231 |  |
Total assets | 494,164 | 463,298 |  |
Accounts payable | 106,271 | 97,457 |  |
Other current liabilities | 6,275 | 9,348 |  |
Total current liabilities | 194,669 | 182,292 |  |
Other long-term liabilities | 1,230 | 1,271 |  |
Variable Interest Entity, Primary Beneficiary |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Cash and cash equivalents | 4,580 | 8,590 |  |
Receivables, including retainage | 31,158 | 26,844 |  |
Other current assets | 16,054 | 15,672 |  |
Total current assets | 51,792 | 51,106 |  |
Property and equipment, net | 7,696 | 9,001 |  |
Goodwill | 1,501 | 1,501 |  |
Total assets | 60,989 | 61,608 |  |
Accounts payable | 28,561 | 28,448 |  |
Other current liabilities | 13,150 | 11,798 |  |
Total current liabilities | 41,711 | 40,246 |  |
Other long-term liabilities | 67 | 3,491 |  |
Total liabilities | $ 41,778 | $ 43,737 |  |

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