Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net (loss) income	$ (1,332)	$ 4,286
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization expense	24,141	23,390
Write-down of equipment	1,867	2,129
Stock-based compensation expenses	2,762	2,117
Amortization of deferred costs	1,145	1,448
Allowances and provisions	(226)	168
Gain on sale of leased equipment	0	(2,067)
Loss (income) from joint ventures	519	(207)
Loss on debt extinguishment	0	4,688
Loss on disposal of property, equipment and furnishings	40	0
Deferred income taxes	(484)	4,129
Changes in assets and liabilities:
Receivables	(11,988)	(7,232)
Inventory	980	894
Other assets	(934)	(624)
Accounts payable and accrued expenses	(648)	(12,630)
Maintenance reserves	6,299	5,537
Security deposits	135	3,734
Unearned revenue	351	(1,500)
Net cash provided by operating activities	22,627	28,260
Cash flows from investing activities:
Proceeds from sale of equipment (net of selling expenses)	0	11,710
Issuance of notes receivable	(39,801)	(80,063)
Payments received on notes receivable	958	2,355
Purchase of equipment held for operating lease	(26,510)	(75,727)
Purchase of property, equipment and furnishings	(121)	(1,470)
Net cash used in investing activities	(65,474)	(143,195)
Cash flows from financing activities:
Proceeds from debt obligations	54,000	643,200
Debt issuance costs	0	(5,779)
Principal payments on debt obligations	(24,617)	(265,574)
Debt prepayment costs	0	(2,374)
Proceeds from shares issued under stock compensation plans	169	200
Cancellation of restricted stock units in satisfaction of withholding tax	(47)	(348)
Preferred stock dividends	(819)	(819)
Net cash provided by financing activities	28,686	368,506
(Decrease) increase in cash, cash equivalents and restricted cash	(14,161)	253,571
Cash, cash equivalents and restricted cash at beginning of period	78,925	63,668
Cash, cash equivalents and restricted cash at end of period	64,764	317,239
Net cash paid for:
Interest	12,344	14,005
Income Taxes	170	(12)
Supplemental disclosures of non-cash activities:
Purchase of equipment held for operating lease	0	5,680
Transfers from Equipment held for operating lease to Spare parts inventory	169	889
Transfers from Spare parts inventory to Equipment held for operating lease	585	0
Accrued preferred stock dividends	$ 18	$ 9