Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Assets
Cash	$ 4,484	$ 2,501
Accounts receivable, net of allowance for doubtful accounts of $1,883 in 2018 and $1,920 in 2017	105,095	105,872
Rental equipment, at cost:
Relocatable modular buildings	789,158	775,400
Electronic test equipment	278,253	262,325
Liquid and solid containment tanks and boxes	312,168	309,808
Rental equipment, gross	1,379,579	1,347,533
Less accumulated depreciation	(503,057)	(485,213)
Rental equipment, net	876,522	862,320
Property, plant and equipment, net	121,614	119,170
Prepaid expenses and other assets	37,397	22,459
Intangible assets, net	7,289	7,724
Goodwill	27,808	27,808
Total assets	1,180,209	1,147,854
Liabilities:
Notes payable	314,860	303,414
Accounts payable and accrued liabilities	89,064	86,408
Deferred income	44,073	39,219
Deferred income taxes, net	195,017	194,629
Total liabilities	643,014	623,670
Shareholders’ equity:
Common stock, no par value - Authorized 40,000 shares Issued and outstanding - 24,170 shares as of June 30, 2018 and 24,052 shares as of December 31, 2017	101,983	102,947
Retained earnings	435,279	421,405
Accumulated other comprehensive loss	(67)	(168)
Total shareholders’ equity	537,195	524,184
Total liabilities and shareholders’ equity	$ 1,180,209	$ 1,147,854