Segment and Geographic Information - Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Industry Segment Information
Total leasing revenues	$ 327,757	$ 336,668	$ 970,622	$ 1,016,093
Trading margin	3,869	4,150	7,822	12,233
Net gain on sale of leasing equipment	10,737	6,196	19,351	22,184
Depreciation and amortization expense	136,248	133,367	402,235	403,324
Interest and debt expense	62,776	77,401	198,652	243,181
Realized (gain) loss on derivative instruments, net	0	(539)	(224)	(1,912)
Income before income taxes	96,628	97,822	256,814	295,432
Payments to Acquire Productive Assets	134,637	10,532	354,425	160,518
Unrealized (gain) loss on derivative instruments, net	300	500	286	2,757
Debt termination expense	24,345	1,870	24,376	2,428
Equipment held for sale	104,923		104,923		$ 114,504
Goodwill at the end of the period	236,665		236,665		236,665
Total assets at the end of the period	9,624,675		9,624,675		9,642,633
Equipment Leasing
Industry Segment Information
Total leasing revenues	325,279	336,088	965,936	1,014,055
Trading margin	0	0	0	0
Net gain on sale of leasing equipment	10,737		19,351
Depreciation and amortization expense	136,058	133,194	401,692	402,797
Interest and debt expense	62,138	77,058	197,320	242,115
Realized (gain) loss on derivative instruments, net	0	(536)	(223)	(1,905)
Income before income taxes	91,986	94,394	248,346	285,154
Payments to Acquire Productive Assets	134,637	10,532	354,425	160,518
Equipment held for sale	75,266		75,266		89,755
Goodwill at the end of the period	220,864		220,864		220,864
Total assets at the end of the period	9,516,904		9,516,904		9,596,263
Equipment Trading
Industry Segment Information
Total leasing revenues	2,478	580	4,686	2,038
Trading margin	3,869	4,150	7,822	12,233
Net gain on sale of leasing equipment	0	0	0	0
Depreciation and amortization expense	190	173	543	527
Interest and debt expense	638	343	1,332	1,066
Realized (gain) loss on derivative instruments, net	0	(3)	(1)	(7)
Income before income taxes	4,642	3,428	8,468	10,278
Payments to Acquire Productive Assets	0	$ 0	0	$ 0
Equipment held for sale	29,657		29,657		24,749
Goodwill at the end of the period	15,801		15,801		15,801
Total assets at the end of the period	$ 107,771		$ 107,771		$ 46,370