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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 |  |

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