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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Related Party Transaction
Revenue from related parties	$ 18,005	$ 36,502	$ 40,328	$ 71,775
CPA:17 – Global
Related Party Transaction
Revenue from related parties	0	14,553	0	30,337
CPA:18 – Global
Related Party Transaction
Revenue from related parties	5,862	11,147	13,819	18,034
CWI 1
Related Party Transaction
Revenue from related parties	6,140	5,643	13,641	12,622
CWI 2
Related Party Transaction
Revenue from related parties	4,904	4,408	10,650	9,445
CESH
Related Party Transaction
Revenue from related parties	$ 1,099	$ 751	$ 2,218	$ 1,337

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=116637345&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=116634182&loc=SL114868664-224227

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