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.

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

Commitments and Contingencies - Agreements and Investments (Details)	Dec. 31, 2019	Dec. 31, 2018	Aug. 31, 2018
Co-venture and Management [Member]
Other Commitments [Line Items]
Annual Investment Management Fee			1.50%
TP Fund
Other Commitments [Line Items]
Annual Investment Management Fee	1.25%	1.50%