Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
REVENUE
Gain on sale of leased equipment	$ 2,440	$ 0	$ 2,440	$ 1,367
Total revenue	70,791	70,613	198,388	227,205
EXPENSES
Depreciation and amortization expense	21,274	24,022	68,755	71,176
Cost of spare parts and equipment sales	3,921	4,125	11,008	13,461
Write-down of equipment	0	5,245	4,113	14,371
General and administrative	18,662	16,461	54,312	51,256
Technical expense	2,524	827	6,130	3,422
Net finance costs:
Interest expense	18,325	15,351	50,331	47,136
Loss on debt extinguishment	0	0	0	4,688
Total net finance costs	18,325	15,351	50,331	51,824
Total expenses	64,706	66,031	194,649	205,510
Earnings from operations	6,085	4,582	3,739	21,695
Earnings (loss) from joint ventures	21	1,457	(1,183)	2,612
Income before income taxes	6,106	6,039	2,556	24,307
Income tax expense	3,222	3,055	946	11,665
Net income	2,884	2,984	1,610	12,642
Preferred stock dividends	819	819	2,431	2,440
Accretion of preferred stock issuance costs	21	21	63	63
Net income (loss) attributable to common shareholders	$ 2,044	$ 2,144	$ (884)	$ 10,139
Basic weighted average earnings (loss) per common share (in dollars per share)	$ 0.33	$ 0.36	$ (0.14)	$ 1.70
Diluted weighted average earnings (loss) per common share (in dollars per share)	$ 0.32	$ 0.35	$ (0.14)	$ 1.66
Basic weighted average common shares outstanding (in shares)	6,189	5,985	6,135	5,954
Diluted weighted average common shares outstanding (in shares)	6,363	6,084	6,135	6,104
Lease rent revenue
REVENUE
Lease rent and maintenance reserve revenues	$ 32,908	$ 30,025	$ 96,859	$ 114,874
Maintenance reserve revenue
REVENUE
Lease rent and maintenance reserve revenues	23,659	32,302	60,749	82,816
Spare parts and equipment sales
REVENUE
Other sales and revenues	5,091	2,888	13,226	14,848
Asset transition fee
REVENUE
Other sales and revenues	0	0	6,256	0
Other revenue
REVENUE
Other sales and revenues	$ 6,693	$ 5,398	$ 18,858	$ 13,300

Total costs of sales and operating expenses for the period.

Name:	us-gaap_CostsAndExpenses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585