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Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests - Balance sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Current assets: |  |  |  |
Cash and cash equivalents | $ 83,953 | $ 42,785 | $ 4,426 | $ 22,843
Receivables, including retainage | 133,931 | 84,132 |  |
Other current assets | 7,529 | 5,448 |  |
Total current assets | 278,526 | 175,908 |  |
Property and equipment, net | 54,406 | 68,127 |  |
Goodwill | 85,231 | 54,820 |  |
Total assets | 463,298 | 301,823 |  |
Current liabilities: |  |  |  |
Accounts payable | 97,457 | 67,097 |  |
Total current liabilities | 182,292 | 146,592 |  |
Variable Interest Entity, Primary Beneficiary |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 8,590 | 9,655 |  |
Receivables, including retainage | 26,844 | 15,046 |  |
Other current assets | 15,672 | 10,208 |  |
Total current assets | 51,106 | 34,909 |  |
Property and equipment, net | 9,001 | 9,824 |  |
Goodwill | 1,501 | 1,501 |  |
Total assets | 61,608 | 46,234 |  |
Current liabilities: |  |  |  |
Accounts payable | 28,448 | 21,274 |  |
Other current liabilities | 11,798 | 8,782 |  |
Total current liabilities | 40,246 | 30,056 |  |
Long-term liabilities: |  |  |  |
Other long-term liabilities | 3,491 | 5,373 |  |
Total liabilities | $ 43,737 | $ 35,429 |  |

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