Finance Receivables - Narratives (Details) $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2020 USD ($)	Jun. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) property	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) property	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) loan	Jan. 01, 2020 USD ($)
Finance Receivables
Accounting Standards Update [Extensible List]							us-gaap:AccountingStandardsUpdate201613Member
Distributions in excess of accumulated earnings			$ 1,800,875		$ 1,800,875		$ 1,557,374
Allowance for credit loss					10,313	$ 0
Adjustments to allowance for credit loss					7,400
Interest income from direct financing leases			17,600	$ 25,400	56,500	77,300
Direct financing lease, net investments reclassified			(715,541)		(715,541)		$ (896,549)
Increase in value of balance sheet item due to foreign currency translation			34,170	(37,412)	(4,183)	(41,772)
Number of loans receivable (loans) | loan							2
Loans receivable			32,500		32,500		$ 47,700
Proceeds from repayment of loans receivable	$ 11,000	$ 9,300			11,000	9,707
Loans receivable, allowance for credit losses			4,200		4,200
Interest income from loans receivables				$ 1,500	1,000	$ 4,900
Direct financing lease
Finance Receivables
Increase in value of balance sheet item due to foreign currency translation					9,300
Domestic Investment
Finance Receivables
Allowance for credit loss			4,200		4,200
Adjustments
Finance Receivables
Direct financing lease, net investments reclassified			$ 166,000		166,000
Net investments in direct financing lease
Finance Receivables
Allowance for credit loss					$ 6,100
Direct financing lease
Finance Receivables
Number of properties sold | property					1
Decrease in direct financing lease related to sales					$ 300
Direct financing lease | Adjustments
Finance Receivables
Direct financing lease, number of properties reclassified | property			55		55
Cumulative effect of Adoption
Finance Receivables
Distributions in excess of accumulated earnings								$ (14,800)