Joint Ventures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Assets:
Cash and cash equivalents		$ 504,985	$ 435,990	$ 396,937	$ 447,766
Accounts receivable		347,212	453,042
Other current assets		137,384	164,257
Property, plant and equipment, net		4,225,034	4,930,549
Other long-term assets		151,365	247,219
Total assets		5,817,308	6,760,658
Liabilities:
Accounts payable		216,495	295,159
Accrued liabilities		247,181	333,282
Total liabilities		4,019,058	4,285,101
SANAD
Assets:
Cash and cash equivalents		381,241	289,575
Accounts receivable		46,467	68,624
Other current assets		15,979	18,149
Property, plant and equipment, net		435,149	455,751
Other long-term assets		6,422	15,118
Total assets		885,258	847,217
Liabilities:
Accounts payable		57,493	64,365
Accrued liabilities		23,440	17,929
Total liabilities		$ 80,933	$ 82,294
SANAD | Saudi Aramco
Joint Ventures
Cash contribution for joint venture	$ 20,000
Additional contribution amount	$ 394,000
Maturity period	25 years