Long-Term Debt - Twelfth Amendment (Details) - USD ($) $ in Millions		6 Months Ended
May 08, 2020	Jun. 30, 2020
Coronavirus Aid, Relief and Economic Security Act \| Unsecured Debt
Debt Instrument [Line Items]
Proceeds from sssuance of unsecured debt	$ 2.2	$ 2.2

The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

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