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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Estimated Useful Lives and Residual Values of Company's Rental Equipment

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

Property, plant and equipment consist of the following:

(dollar amounts in thousands)		Estimated useful life				December 31,
		in years				2018				2017
Land		Indefinite				$	50,689			$	50,689
Land improvements		20 – 50					50,064				43,337
Buildings			30				29,359				26,862
Furniture, office and computer equipment		3 – 10					33,081				32,118
Vehicles and machinery		5 – 25					38,199				34,597
							201,392				187,603
Less accumulated depreciation							(77,118	)			(70,034	)
							124,274				117,569
Construction in progress							2,625				1,601
						$	126,899			$	119,170

Weighted-Average Common Stock Used to Calculate Basic and Diluted Earnings per Share

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

(in thousands)		Year Ended December 31,
		2018				2017				2016
Weighted-average common stock for calculating basic    earnings per share			24,141				23,999				23,900
Effect of potentially dilutive securities from equity-based    compensation			399				270				76
Weighted-average common stock for calculating diluted    earnings per share			24,540				24,269				23,976

Securities Not Included in Computation of Diluted Earnings Per Share

The following securities were not included in the computation of diluted earnings per share as their effect would have been anti-dilutive:

(in thousands)		Year Ended December 31,
		2018				2017				2016
Options to purchase common stock			—				7				661

Summary of Allowance for Doubtful Accounts Activity

The allowance for doubtful accounts activity was as follows:

(in thousands)		2018				2017
Beginning balance, January 1		$	1,920			$	2,087
Provision for doubtful accounts			581				1,480
Write-offs, net of recoveries			(618	)			(1,647	)
Ending balance, December 31		$	1,883			$	1,920

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Useful live and residual value.

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Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.

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