Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets
Cash	$ 4,448	$ 2,501
Accounts receivable, net of allowance for doubtful accounts of $1,883 in 2018 and $1,920 in 2017	98,092	105,872
Rental equipment, at cost:
Relocatable modular buildings	779,839	775,400
Electronic test equipment	269,043	262,325
Liquid and solid containment tanks and boxes	310,478	309,808
Rental equipment, gross	1,359,360	1,347,533
Less accumulated depreciation	(494,022)	(485,213)
Rental equipment, net	865,338	862,320
Property, plant and equipment, net	119,904	119,170
Prepaid expenses and other assets	25,762	22,459
Intangible assets, net	7,506	7,724
Goodwill	27,808	27,808
Total assets	1,148,858	1,147,854
Liabilities:
Notes payable	300,595	303,414
Accounts payable and accrued liabilities	84,666	86,408
Deferred income	38,502	39,219
Deferred income taxes, net	194,811	194,629
Total liabilities	618,574	623,670
Shareholders’ equity:
Common stock, no par value - Authorized 40,000 shares Issued and outstanding - 24,102 shares as of March 31, 2018 and 24,052 shares as of December 31, 2017	102,840	102,947
Retained earnings	427,634	421,405
Accumulated other comprehensive loss	(190)	(168)
Total shareholders’ equity	530,284	524,184
Total liabilities and shareholders’ equity	$ 1,148,858	$ 1,147,854