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Joint Ventures (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Jun. 30, 2019 | Dec. 31, 2018
Assets: |  |  |  |
Accounts receivable |  |  | $ 737,353 | $ 756,320
Other current assets |  |  | 147,239 | 177,604
Property, plant and equipment, net |  |  | 5,301,252 | 5,467,870
Other long-term assets |  |  | 298,660 | 263,506
Total assets (1) | [1] |  | 7,514,503 | 7,853,944
Liabilities: |  |  |  |
Accounts payable |  |  | 410,469 | 392,843
Accrued liabilities |  |  | 319,763 | 417,912
Total liabilities (1) | [1] |  | 4,644,320 | 4,698,757
SANAD |  |  |  |
Assets: |  |  |  |
Cash and cash equivalents |  |  | 230,352 | 211,618
Accounts receivable |  |  | 81,440 | 73,699
Other current assets |  |  | 21,236 | 17,198
Property, plant and equipment, net |  |  | 443,643 | 457,963
Other long-term assets |  |  | 16,490 | 36,583
Total assets (1) |  |  | 793,161 | 797,061
Liabilities: |  |  |  |
Accounts payable |  |  | 65,655 | 60,087
Accrued liabilities |  |  | 14,367 | 8,530
Total liabilities (1) |  |  | $ 80,022 | $ 68,617
Saudi Aramco | SANAD |  |  |  |
Joint Ventures |  |  |  |
Cash contribution for joint venture |  | $ 20,000 |  |
Additional contribution amount |  | $ 394,000 |  |
Maturity period |  | 25 years |  |
[1] | The condensed consolidated balance sheet as of June 30, 2019 and December 31, 2018 include assets and liabilities of variable interest entities. See Note 3—Joint Ventures for additional information.

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