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Leases (Tables)
12 Months Ended
Dec. 31, 2012
Future Minimum Lease and Mineral and Other Royalty Commitments for All Noncancelable Agreements

Future minimum lease and mineral and other royalty commitments for all noncancelable agreements as of December 31, 2012 are as follows:

 

     (add 000)        

2013

   $ 75,298   

2014

     55,706   

2015

     51,353   

2016

     38,828   

2017

     29,851   

Thereafter

     109,464   

Total

   $ 360,500