Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Assets
Cash	$ 777	$ 1,167
Accounts receivable, net of allowance for doubtful accounts of $2,042 in 2015 and $2,038 in 2014	89,361	101,294
Rental equipment, at cost:
Relocatable modular buildings	678,990	664,340
Electronic test equipment	269,575	261,995
Liquid and solid containment tanks and boxes	305,751	303,303
Rental equipment, gross	1,254,316	1,229,638
Less accumulated depreciation	(415,238)	(403,888)
Rental equipment, net	839,078	825,750
Property, plant and equipment, net	109,627	108,628
Prepaid expenses and other assets	35,287	41,424
Intangible assets, net	10,118	10,336
Goodwill	27,808	27,808
Total assets	1,112,056	1,116,407
Liabilities:
Notes payable	320,923	322,478
Accounts payable and accrued liabilities	70,242	71,357
Deferred income	29,359	29,139
Deferred income taxes, net	265,684	268,902
Total liabilities	686,208	691,876
Shareholders' equity:
Common stock, no par value - Authorized - 40,000 shares Issued and Outstanding - 26,130 shares as of March 31, 2015 and 26,051 shares as of December 31, 2014	107,745	106,469
Retained earnings	318,133	318,164
Accumulated other comprehensive loss	(30)	(102)
Total shareholders' equity	425,848	424,531
Total liabilities and shareholders' equity	$ 1,112,056	$ 1,116,407