Notes Payable - Narrative (Details) - Notes and bonds payable	9 Months Ended
Sep. 30, 2019
Debt
Weighted average interest rate (as a percent)	3.90%
Weighted average remaining years until maturity	8 years 6 months

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