CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Current assets
Accounts receivable, allowance for doubtful accounts	$ 2,042	$ 1,440
Rental equipment net of accumulated depreciation	2,265,260	2,004,961
Rental equipment, accumulated depreciation	599,443	505,546
Net investment in direct finance leases	473,792	246,450
Intangible assets, accumulated amortization	5,397	3,407
Furniture, fixtures and equipment, accumulated depreciation	2,635	3,201
Current liabilities
Current portion of debt	311,381	132,049
Debt	$ 1,847,633	$ 1,570,773
Stockholders' equity
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	10,000,000	5,000,000
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	84,000,000	84,000,000
Common stock, shares issued	18,764,459	20,390,622
Common stock, shares outstanding	18,764,459	20,390,622
Variable Interest Entity, Primary Beneficiary [Member]
Current assets
Cash	$ 25,211	$ 20,685
Rental equipment net of accumulated depreciation	71,958	61,842
Net investment in direct finance leases	13,862	4,423
Current liabilities
Current portion of debt	41,066	22,549
Debt	$ 67,615	$ 72,727
Series A Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Stock [Member]
Stockholders' equity
Preferred stock, dividend rate	8.50%	8.50%
Preferred stock, shares issued	2,199,610	0
Preferred stock, shares outstanding	2,199,160	0
Series B Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Stock [Member]
Stockholders' equity
Preferred stock, dividend rate	8.50%	8.50%
Preferred stock, shares issued	1,955,000	0
Preferred stock, shares outstanding	1,955,000	0