Lease Investments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Schedule of the Components of Income from Direct Finance and Operating Lease Equipment [Line Items]
Interest income on lease receivable	$ 2,280	$ 3,020	$ 8,699	$ 9,689
Income related to lease payments	7,578	7,977	23,369	23,836
Minimum lease payments	208,123		208,123		$ 257,398
Estimated unguaranteed residual values	41		41		41
Less: unearned income	(35,719)		(35,719)		(46,709)
Net investment in direct finance lease financing	172,445		172,445		210,730
Gross investment in operating lease financing	189,543		189,543		199,954
Accumulated depreciation	(70,372)		(70,372)		(65,514)
Net investment in operating lease financings	119,171		119,171		134,440
Carrying amount of residual assets covered by residual value guarantees	75,000		75,000		$ 87,610
Income from reimbursements for personal property tax payments on operating leased equipment	150		500
Expense for payments of personal property taxes on operating leased equipment	150		500
Assets Leased to Others
Schedule of the Components of Income from Direct Finance and Operating Lease Equipment [Line Items]
Depreciation expense	$ 6,198	$ 6,580	$ 19,122	$ 19,692