Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2016

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
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	10 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		2016			2015
Land	Indefinite		$	45,928		$	40,378
Land improvements	20 – 50			42,677			42,004
Buildings		30		26,105			25,520
Furniture, office and computer equipment	3 – 10			35,215			34,053
Machinery and service equipment	5 – 25			30,416			28,642
				180,341			170,597
Less accumulated depreciation				(68,854	)		(61,410	)
				111,487			109,187
Construction in progress				703			566
			$	112,190		$	109,753

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,
	2016		2015		2014
Weighted-average common stock for calculating basic    earnings per share		23,900		25,369		25,914
Effect of potentially dilutive securities from equity-based    compensation		76		88		261
Weighted-average common stock for calculating diluted    earnings per share		23,976		25,457		26,175

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,
	2016		2015		2014
Options to purchase common stock		661		746		9

Summary of Share Repurchase Activities

The following table presents share repurchase activities during the years ended December 31, 2016 and 2015:

	Year ended December 31
(in thousands, except share and per share amounts)	2016		2015
Number of shares repurchased		—		2,407,974
Aggregate purchase price		—		63,953
Average price per repurchased shares		—		26.56

Summary of Allowance for Doubtful Accounts Activity

The allowance for doubtful accounts activity was as follows:

(in thousands)	2016			2015
Beginning balance, January 1	$	2,087		$	2,038
Provision for doubtful accounts		1,892			2,149
Write-offs, net of recoveries		(1,892	)		(2,100	)
Ending balance, December 31	$	2,087		$	2,087