Summary of Significant Accounting Policies (Scheduled Maturities of Direct Financing Leases) (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Summary of Significant Accounting Policies [Abstract]
2020	$ 134,202
2021	96,385
2022	61,090
2023	32,712
2024	11,930
2025 and thereafter	1,809
Total undiscounted cash flows	338,128
Residual value	142,730	[1]
Difference between undiscounted cash flows and discounted cash flows	(46,398)
Present value of lease payments recorded as lease receivables	434,460
Direct residual value not guaranteed	$ 29,638

[1] Of the $142,730, $29,638 is not guaranteed by the lessee