Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
ASSETS
Cash	$ 461	$ 1,612
Accounts Receivable, net of allowance for doubtful accounts of $2,550 in 2013 and $3,000 in 2012	87,026	92,256
Rental Equipment, at cost:
Relocatable Modular Buildings	558,471	551,101
Electronic Test Equipment	267,411	266,934
Liquid and Solid Containment Tanks and Boxes	261,483	254,810
Rental Equipment, gross	1,087,365	1,072,845
Less Accumulated Depreciation	(361,265)	(353,992)
Rental Equipment, net	726,100	718,853
Property, Plant and Equipment, net	100,584	101,031
Prepaid Expenses and Other Assets	13,979	19,507
Intangible Assets, net	11,281	11,487
Goodwill	27,700	27,700
Total Assets	967,131	972,446
Liabilities:
Notes Payable	281,251	302,000
Accounts Payable and Accrued Liabilities	62,353	52,220
Deferred Income	20,642	26,924
Deferred Income Taxes, net	230,021	226,564
Total Liabilities	594,267	607,708
Shareholders' Equity:
Common Stock, no par value - Authorized - 40,000 shares Issued and Outstanding - 25,191 shares in 2013 and 24,931 shares in 2012	90,405	85,342
Retained Earnings	282,459	279,396
Total Shareholders' Equity	372,864	364,738
Total Liabilities and Shareholders' Equity	$ 967,131	$ 972,446