Joint Ventures (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2021	Dec. 31, 2017	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Assets:
Cash and cash equivalents			$ 417,544	$ 472,246	$ 480,522	$ 435,990
Accounts receivable			331,453	362,977
Other current assets			116,182	109,595
Property, plant and equipment, net			3,829,222	3,985,707
Other long-term assets			140,790	139,085
Total assets			5,254,906	5,503,428
Liabilities:
Accounts payable			234,944	220,922
Accrued liabilities			222,361	276,085
Total liabilities			3,730,785	3,803,780
SANAD
Joint Ventures
Settled accrued interest	$ 100,000
Assets:
Cash and cash equivalents			297,930	368,981
Accounts receivable			74,140	79,711
Other current assets			13,854	17,148
Property, plant and equipment, net			421,951	428,331
Other long-term assets			20,654	2,590
Total assets			828,529	896,761
Liabilities:
Accounts payable			59,239	61,808
Accrued liabilities			25,745	18,791
Total liabilities			$ 84,984	$ 80,599
SANAD | Saudi Aramco
Joint Ventures
Cash contribution for joint venture		$ 20,000
Additional contribution amount		$ 394,000
Maturity period		25 years