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Selected Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Selected Quarterly Financial Data [Line Items]
Operating and Capital Leases Income Statement Lease Revenue	$ 331,176	$ 336,668	$ 338,566	$ 340,859	$ 355,357	$ 350,078	$ 329,771	$ 315,097	$ 1,347,269	$ 1,350,303	$ 1,163,517
Gross Profit	2,275	4,150	4,496	3,587	6,126	5,810	3,994	2,991	14,508	18,921	4,184
Net gain (loss) on sale of leasing equipment	4,857	6,196	7,519	8,469	7,999	7,055	11,105	9,218	27,041	35,377	35,812
Net (loss) income	$ 77,161	$ 85,895	$ 84,071	$ 91,914	$ 69,557	$ 94,236	$ 104,870	$ 80,892	$ 339,041	$ 349,555	$ 344,598
Net income (loss) per common share—Basic	$ 1.07	$ 1.18	$ 1.13	$ 1.18	$ 0.88	$ 1.18	$ 1.31	$ 1.01	$ 4.57	$ 4.38	$ 4.55
Net income (loss) per common share—Diluted	$ 1.07	$ 1.17	$ 1.12	$ 1.17	$ 0.87	$ 1.17	$ 1.30	$ 1.00	$ 4.54	$ 4.35	$ 4.52

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- Definition

The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue, sublease revenue and capital leases.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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