Agreements and Transactions with Related Parties - Related Party Income, by Program (Details) - Affiliated Entity - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Related Party Transaction
Revenue from related parties	$ 6,192	$ 21,367	$ 31,793	$ 61,695
CPA:18 – Global
Related Party Transaction
Revenue from related parties	4,865	5,939	16,327	19,758
CWI 1
Related Party Transaction
Revenue from related parties	0	8,772	5,662	22,413
CWI 2
Related Party Transaction
Revenue from related parties	0	5,073	4,668	15,723
CESH
Related Party Transaction
Revenue from related parties	983	1,583	3,663	3,801
WLT
Related Party Transaction
Revenue from related parties	$ 344	$ 0	$ 1,473	$ 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