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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2013
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
In Years		      December 31,  
      2013     2012  

Land

      Indefinite       $ 37,354      $ 35,371   

Land Improvements

      20 – 50         39,068        38,708   

Buildings

      30         21,151        20,522   

Furniture, Office and Computer Equipment

      3 – 10         30,761        26,496   

Machinery and Service Equipment

      5 – 20         20,106        16,186   
     

 

 

    

 

 

  
        148,440        137,283   

Less Accumulated Depreciation

         (47,058 )      (39,301 ) 
     

 

 

    

 

 

  
        101,382        97,982   

Construction In Progress

         3,805        3,049   
     

 

 

    

 

 

  
                $105,187        $101,031   
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,  
         2013              2012              2011      

Weighted-average common stock for calculating basic earnings per share

      25,433         24,759         24,349   

Effect of potentially dilutive securities from equity-based compensation

      493         397         411   
  

 

 

     

 

 

     

 

 

  

Weighted-average common stock for calculating diluted earnings per share

      25,926         25,156         24,760   
Securities Not Included in the 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,  
         2013              2012              2011      

Options to purchase common stock

      20         1,049         1,131   
Summary of Allowance for Doubtful Accounts Activity

The allowance for doubtful accounts activity was as follows:

 

(in thousands)    2013     2012  

Beginning Balance, January 1

    $ 3,000      $ 1,500   

Provision for doubtful accounts

      2,144        4,263   

Write-offs, net of recoveries

      (3,137 )      (2,763 ) 
  

 

 

    

 

 

  

Ending Balance, December 31

    $ 2,007      $ 3,000