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Joint Ventures (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Jun. 30, 2018
Assets: |  |  |
Accounts receivable |  | $ 698,477 | $ 780,247
Other current assets |  | 180,134 | 156,652
Property, plant and equipment, net |  | 6,109,565 | 5,709,895
Other long-term assets |  | 252,854 | 228,824
Total assets (1) | [1] | 8,401,984 | 8,300,288
Liabilities: |  |  |
Accounts payable |  | 363,416 | 379,028
Accrued liabilities |  | 533,044 | 492,787
Total liabilities (1) | [1] | 5,259,213 | 5,003,121
SANAD |  |  |
Assets: |  |  |
Cash and cash equivalents |  | 94,496 | 109,445
Accounts receivable |  | 10,580 | 27,690
Other current assets |  | 10,834 | 8,402
Property, plant and equipment, net |  | 130,218 | 250,904
Other long-term assets |  | 23,091 | 20,750
Total assets (1) |  | 269,219 | 417,191
Liabilities: |  |  |
Accounts payable |  | 7,236 | 45,705
Accrued liabilities |  | 2,592 | 8,002
Total liabilities (1) |  | 9,828 | $ 53,707
Saudi Aramco | SANAD |  |  |
Joint Ventures |  |  |
Cash contribution for joint venture |  | 20,000 |
Additional contribution amount |  | $ 204,000 |
Maturity period |  | 25 years |
[1] | The condensed consolidated balance sheet as of June 30, 2018 and December 31, 2017 include assets and liabilities of variable interest entities. See Note 3—Joint Ventures for additional information.

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