Joint Ventures (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2021	Dec. 31, 2017	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Assets:
Cash and cash equivalents		$ 336,997	$ 472,246	$ 435,990	$ 447,766
Accounts receivable			362,977	453,042
Other current assets			109,595	164,257
Property, plant and equipment, net			3,985,707	4,930,549	$ 5,467,870
Other long-term assets			139,085	247,219
Total assets			5,503,428	6,760,658
Liabilities:
Accounts payable			220,922	295,159
Accrued liabilities			276,085	333,282
Total liabilities			3,803,780	4,285,101
SANAD
Joint Ventures
Settled accrued interest	$ 100,000
Assets:
Cash and cash equivalents			368,981	289,575
Accounts receivable			79,711	68,624
Other current assets			17,148	18,149
Property, plant and equipment, net			428,331	455,751
Other long-term assets			2,590	15,118
Total assets			896,761	847,217
Liabilities:
Accounts payable			61,808	64,365
Accrued liabilities			18,791	17,929
Total liabilities			$ 80,599	$ 82,294
SANAD | Saudi Aramco
Joint Ventures
Cash contribution for joint venture		20,000
Additional contribution amount		$ 394,000
Maturity period		25 years