The value (monetary amount) of the award the plaintiff seeks in the legal matter.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

Name:	us-gaap_LossContingencyDamagesSoughtValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Contingencies and Commitments - Narrative (Details) - USD ($)			1 Months Ended
	Aug. 09, 2018	Jan. 05, 2014	Feb. 28, 2019
Loss Contingencies [Line Items]
Settlement amount	$ 35,000,000
Chaparral Energy, Inc. \| Healthcare of Ontario Pension Plan (HOOPP) \| Pending litigation
Loss Contingencies [Line Items]
Loss contingency, damages sought, value		$ 215,000,000
FTS International, Inc. \| Putative class action lawsuit \| Pending litigation
Loss Contingencies [Line Items]
Loss contingency, damages sought, value			$ 1,000,000