Finance Assets and Lessor Operating Leases (Lease Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Profit recognized at commencement	$ 117,359	$ 146,923	$ 173,060
Interest income	206,517	229,719	245,751
Total lease income from sales-type leases	$ 323,876	$ 376,642	$ 418,811