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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

The estimated useful lives and residual values of the Company’s rental equipment used for financial reporting purposes are as follows:

Relocatable modular buildings		18 years, 50% residual value
Relocatable modular accessories		3 to 18 years, no residual value
Blast resistant modules		20 years, no residual value
Portable storage containers		25 years, 62.5% residual value
Electronic test equipment and accessories		1 to 8 years, no residual value
Liquid and solid containment tanks and boxes and accessories		3 to 20 years, no residual value

Property, plant and equipment consist of the following:

(dollar amounts in thousands)	Estimated useful life		December 31,
	in years		2019			2018
Land	Indefinite		$	54,423		$	50,689
Land improvements	20 – 50			52,325			50,064
Buildings		30		29,848			29,359
Furniture, office and computer equipment	3 – 10			36,610			33,081
Vehicles and machinery	5 – 25			41,877			38,199
				215,083			201,392
Less accumulated depreciation				(84,308	)		(77,118	)
				130,775			124,274
Construction in progress				272			2,625
			$	131,047		$	126,899

The table below presents the weighted-average common stock used to calculate basic and diluted earnings per share:

(in thousands)	Year Ended December 31,
	2019		2018		2017
Weighted-average common stock for calculating basic earnings per share		24,250		24,141		23,999
Effect of potentially dilutive securities from equity-based compensation		373		399		270
Weighted-average common stock for calculating diluted earnings per share		24,623		24,540		24,269

The allowance for doubtful accounts activity was as follows:

(in thousands)	2019			2018
Beginning balance, January 1	$	1,883		$	1,920
Provision for doubtful accounts		1,013			581
Write-offs, net of recoveries		(1,013	)		(618	)
Ending balance, December 31	$	1,883		$	1,883