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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2012
Commitments and Contingencies  
Future obligations under transportation agreements

Future obligations under transportation agreements as of December 31, 2012 are as follows:

(In thousands)
   
 

2013

  $ 94,714  

2014

    98,145  

2015

    115,203  

2016

    126,973  

2017

    121,923  

Thereafter

    1,156,294  
       

 

  $ 1,713,252  
       
Future minimum rental commitments under non-cancelable leases

Future minimum rental commitments under non-cancelable leases in effect at December 31, 2012 are as follows:

(In thousands)
   
 

2013

  $ 5,106  

2014

    4,652  

2015

    3,624  

2016

    730  

2017

    192  

Thereafter

     
       

 

  $ 14,304