Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8672-108599

Name:	us-gaap_NumberOfOperatingSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Nature of Operations and Basis of Presentation (Details) $ in Thousands, ft³ in Billions	3 Months Ended	9 Months Ended
	Mar. 31, 2020 USD ($)	Sep. 30, 2020 segment	Jun. 28, 2019 USD ($) ft³
Error Corrections and Prior Period Adjustments Restatement
Number of primary business lines \| segment		4
Impairment of long lived assets	$ 4,352
Discontinued Operations, Disposed of by Sale \| Natural Gas Storage Assets
Error Corrections and Prior Period Adjustments Restatement
Natural gas storage (in cubic feet) \| ft³			50
Proceeds from sale of assets			$ 210,067