Debt (Schedule of Long-term Debt) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	May 29, 2020
Convertible Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 129,771	$ 129,771
Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 79,032	$ 78,100

Face (par) amount of debt instrument at time of issuance.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant