CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Current assets
Accounts receivable, allowance for doubtful accounts	$ 393	$ 7,671
Rental equipment net of accumulated depreciation	1,781,321	1,820,735
Rental equipment, accumulated depreciation	669,360	588,815
Net investment in direct finance leases	550,573	495,488
Current liabilities
Current portion of debt	183,448	218,094
Debt	$ 1,562,283	$ 1,880,122
Stockholders' equity
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	84,000,000	84,000,000
Common stock, shares issued	17,562,779	17,479,127
Common stock, shares outstanding	17,562,779	17,479,127
Variable Interest Entity, Primary Beneficiary [Member]
Current assets
Cash	$ 26,856	$ 26,594
Rental equipment net of accumulated depreciation	77,907	101,907
Net investment in direct finance leases	2,683	4,790
Current liabilities
Current portion of debt	41,344	26,931
Debt	$ 59,519	$ 100,849
Series A Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Stock [Member]
Stockholders' equity
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, dividend rate	8.50%	8.50%
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	2,199,610	2,199,610
Preferred stock, shares outstanding	2,199,610	2,199,610
Series B Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Stock [Member]
Stockholders' equity
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, dividend rate	8.50%	8.50%
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	1,955,000	1,955,000
Preferred stock, shares outstanding	1,955,000	1,955,000