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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2013
Property, Plant and Equipment  
Major Components of Property, Plant and Equipment

 

 

 
   December 31,  
 
   2013   2012  
 
   (In thousands)
  

Land

   $ 63,733   $ 49,965  

Buildings

     163,962     154,878  

Drilling, workover and well-servicing rigs, and related equipment

     12,818,136     12,364,021  

Marine transportation and supply vessels

     14,062     14,054  

Oilfield hauling and mobile equipment

     1,322,798     1,313,339  

Other machinery and equipment

     168,465     176,468  

Construction-in-process(1)

     693,475     363,537  
           
​ ​ ​ ​ ​ ​ ​ ​

 

   $ 15,244,631   $ 14,436,262  

Less: accumulated depreciation and amortization

     (6,646,818 )   (5,724,174 )
           
​ ​ ​ ​ ​ ​ ​ ​

 

   $ 8,597,813   $ 8,712,088  
           
​ ​ ​ ​ ​ ​ ​ ​
(1)
Relates primarily to amounts capitalized for new or substantially new drilling, workover and well-servicing rigs that were under construction and had not yet been placed in service as of December 31, 2013 or 2012.