Stock Compensation (Summary of Vesting Date Fair Value of Awards) (Details 11) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 18, 2020	Dec. 31, 2019	Dec. 31, 2018
Performance-Based Operational Awards
Stock Compensation
Vesting date fair value	$ 0	$ 0	$ 595
Performance-Based TSR Awards
Stock Compensation
Vesting date fair value	$ 79	$ 2,783	$ 542

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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