Registration of securities issued in business combination transactions

Summary of Significant Accounting Policies (Tables)

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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2013
Accounting Policies [Abstract]  
Summary of Significant Total Accounts and Notes Receivable

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     December 31,  
     2013     2012  
     (Dollars in Thousands)  

Trade

    $ 270,498      $ 176,082   

Notes receivable

      244        650   

Allowance for doubtful accounts(1)

      (12,853 )      (8,117 ) 
  

 

 

    

 

 

  

Total accounts and notes receivable, net of allowance for bad debt

    $ 257,889      $ 168,615   
  

 

 

    

 

 

  

 

(1) Additional information on the allowance for doubtful accounts for the years ended December 31, 2013, 2012 and 2011 is reported on Schedule II — Valuation and Qualifying Accounts.
Summary of Depreciable Lives for Different Categories of Property Plant and Equipment

Depreciable lives for different categories of property, plant and equipment are as follows:

 

Land drilling equipment

      3 to 20 years   

Barge drilling equipment

      3 to 20 years   

Drill pipe, rental tools and other

      4 to 10 years   

Buildings and improvements

      5 to 30 years