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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 |  |

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