Joint Ventures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Assets:
Cash and cash equivalents		$ 480,522	$ 435,990	$ 429,127	$ 447,766
Accounts receivable		454,718	453,042
Other current assets		150,533	164,257
Property, plant and equipment, net		4,597,308	4,930,549
Other long-term assets		159,859	247,219
Total assets (1)		6,308,548	6,760,658
Liabilities:
Accounts payable		297,274	295,159
Accrued liabilities		252,664	333,282
Total liabilities (1)		4,237,626	4,285,101
SANAD
Assets:
Cash and cash equivalents		307,119	289,575
Accounts receivable		91,911	68,624
Other current assets		18,403	18,149
Property, plant and equipment, net		450,821	455,751
Other long-term assets		10,206	15,118
Total assets (1)		878,460	847,217
Liabilities:
Accounts payable		67,875	64,365
Accrued liabilities		20,515	17,929
Total liabilities (1)		$ 88,390	$ 82,294
SANAD | Saudi Aramco
Joint Ventures
Cash contribution for joint venture	$ 20,000
Additional contribution amount	$ 394,000
Maturity period	25 years