Finance Receivables - Narratives (Details) $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended
	Mar. 31, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) property	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) property	Jun. 30, 2019 USD ($)	Jan. 01, 2020 USD ($)	Dec. 31, 2019 USD ($) loan
Finance Receivables
Accounting Standards Update [Extensible List]					us-gaap:AccountingStandardsUpdate201613Member
Distributions in excess of accumulated earnings			$ 1,765,892		$ 1,765,892			$ 1,557,374
Allowance for credit losses					1,906	$ 0
Adjustments to allowance for credit loss					5,900
Interest income from direct financing leases			18,800	$ 25,400	38,900	52,000
Direct financing lease, net investments reclassified			(752,630)		(752,630)			$ (896,549)
Decrease in value of balance sheet item due to foreign currency translation			(13,847)	4,187	38,353	4,360
Number of loans receivable (loans) | loan								2
Loans receivable			36,700		36,700			$ 47,700
Proceeds from repayment of loans receivable	$ 11,000	$ 9,300			11,000	9,574
Interest income from loans receivables				$ 1,700	1,000	$ 3,400
Direct financing lease
Finance Receivables
Decrease in value of balance sheet item due to foreign currency translation					6,300
Adjustments
Finance Receivables
Direct financing lease, net investments reclassified			$ 118,500		$ 118,500
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			53		53
Cumulative effect of Adoption
Finance Receivables
Distributions in excess of accumulated earnings							$ (14,800)