Unsecured Revolving Line of Credit Short Term Debt (Details)	12 Months Ended
Dec. 31, 2019
Short-term Debt [Line Items]
Maximum Ratio Of Indebtedness To Net Capital Threshold Percentage	65.00%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_ShortTermDebtLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration