Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets
Cash	$ 1,238	$ 2,342
Accounts receivable, net of allowance for doubtful accounts of $2,100 in 2020 and $1,883 in 2019	123,316	128,099
Rental equipment, at cost:
Relocatable modular buildings	882,115	868,807
Electronic test equipment	333,020	335,343
Liquid and solid containment tanks and boxes	315,706	316,261
Rental equipment, gross	1,530,841	1,520,411
Less accumulated depreciation	(592,725)	(552,911)
Rental equipment, net	938,116	967,500
Property, plant and equipment, net	136,210	131,047
Prepaid expenses and other assets	41,549	45,356
Intangible assets, net	7,118	7,334
Goodwill	28,197	28,197
Total assets	1,275,744	1,309,875
Liabilities:
Notes payable	222,754	293,431
Accounts payable and accrued liabilities	108,334	109,174
Deferred income	45,975	54,964
Deferred income taxes, net	216,077	218,270
Total liabilities	593,140	675,839
Shareholders’ equity:
Common stock, no par value - Authorized 40,000 shares Issued and outstanding - 24,296 shares as of December 31, 2019 and 24,182 shares as of December 31, 2018	106,289	106,360
Retained earnings	576,419	527,746
Accumulated other comprehensive loss	(104)	(70)
Total shareholders’ equity	682,604	634,036
Total liabilities and shareholders’ equity	$ 1,275,744	$ 1,309,875