Segment and Geographic Information (Details)	3 Months Ended
	Mar. 31, 2020 USD ($) segment	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Industry Segment Information
Number of operating segments | segment	2
Number of reportable segments | segment	2
Total leasing revenues	$ 321,468,000	$ 340,859,000
Trading margin	1,933,000	3,587,000
Net gain on sale of leasing equipment	4,077,000	8,469,000
Depreciation and amortization expense	132,695,000	134,609,000
Interest and debt expense	69,002,000	83,520,000
Realized (gain) loss on derivative instruments, net	(235,000)	(704,000)
Income before income taxes	82,910,000	101,647,000
Payments to Acquire Productive Assets	62,406,000	43,981,000
Equipment held for sale	122,475,000		$ 114,504,000
Goodwill at the end of the period	236,665,000		236,665,000
Total assets at the end of the period	9,874,390,000		9,642,633,000
Equipment trading revenues	15,380,000	17,828,000
Expenses	179,447,000	169,456,000
Unrealized (gain) loss on derivative instruments, net	297,000	986,000
Debt termination expense	31,000	0
Equipment Leasing
Industry Segment Information
Total leasing revenues	321,037,000	340,070,000
Trading margin	0	0
Net gain on sale of leasing equipment	4,077,000
Depreciation and amortization expense	132,518,000	134,422,000
Interest and debt expense	68,699,000	83,174,000
Realized (gain) loss on derivative instruments, net	(234,000)	(702,000)
Income before income taxes	81,517,000	98,466,000
Payments to Acquire Productive Assets	62,406,000	43,981,000
Equipment held for sale	97,403,000		89,755,000
Goodwill at the end of the period	220,864,000		220,864,000
Total assets at the end of the period	9,828,479,000		9,596,263,000
Equipment Trading
Industry Segment Information
Total leasing revenues	431,000	789,000
Trading margin	1,933,000	3,587,000
Net gain on sale of leasing equipment	0	0
Depreciation and amortization expense	177,000	187,000
Interest and debt expense	303,000	346,000
Realized (gain) loss on derivative instruments, net	(1,000)	(2,000)
Income before income taxes	1,393,000	3,181,000
Payments to Acquire Productive Assets	0	0
Equipment held for sale	25,072,000		24,749,000
Goodwill at the end of the period	15,801,000		15,801,000
Total assets at the end of the period	45,911,000		$ 46,370,000
Intersegment Eliminations
Industry Segment Information
Equipment trading revenues	0	0
Expenses	$ 0	0
Continuing Operations [Member] | Equipment Leasing
Industry Segment Information
Net gain on sale of leasing equipment		$ 21,000,000