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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2014
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,  
      2014     2013  

Land

      Indefinite       $ 38,455      $ 37,354   

Land improvements

      20 – 50         39,715        39,068   

Buildings

      30         21,486        21,151   

Furniture, office and computer equipment

      3 – 10         32,544        30,761   

Machinery and service equipment

      5 – 20         24,454        20,106   
     

 

 

    

 

 

  
        156,654        148,440   

Less accumulated depreciation

         (53,503 )      (47,058 ) 
     

 

 

    

 

 

  
        103,151        101,382   

Construction in progress

         5,477        3,805   
     

 

 

    

 

 

  
              $ 108,628      $ 105,187   
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,  
         2014              2013              2012      

Weighted-average common stock for calculating basic earnings per share

      25,914         25,433         24,759   

Effect of potentially dilutive securities from equity-based compensation

      261         493         397   
  

 

 

     

 

 

     

 

 

  

Weighted-average common stock for calculating diluted earnings per share

      26,175         25,926         25,156   
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,  
         2014              2013              2012      

Options to purchase common stock

            9             20         1,049   
Summary of Allowance for Doubtful Accounts Activity

The allowance for doubtful accounts activity was as follows:

 

(in thousands)    2014     2013  

Beginning balance, January 1

    $ 2,007      $ 3,000   

Provision for doubtful accounts

      1,825        2,144   

Write-offs, net of recoveries

      (1,794 )      (3,137 ) 
  

 

 

    

 

 

  

Ending balance, December 31

    $ 2,038      $ 2,007