Agreements and Transactions with Related Parties - Related Party Income, by Program (Details) - Affiliated Entity - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Related Party Transaction
Revenue from related parties	$ 8,995	$ 18,005	$ 25,601	$ 40,328
CPA:18 – Global
Related Party Transaction
Revenue from related parties	5,550	5,862	11,462	13,819
CWI 1
Related Party Transaction
Revenue from related parties	623	6,140	5,662	13,641
CWI 2
Related Party Transaction
Revenue from related parties	468	4,904	4,668	10,650
CESH
Related Party Transaction
Revenue from related parties	1,225	1,099	2,680	2,218
WLT
Related Party Transaction
Revenue from related parties	$ 1,129	$ 0	$ 1,129	$ 0

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07.1(c))
-URI http://asc.fasb.org/extlink&oid=120401555&loc=SL114874292-224272

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration