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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2013
Commitments and Contingencies  
Future minimum obligations under transportation and gathering agreements

 

 

(In thousands)
   
  

2014

   $ 96,939  

2015

     125,350  

2016

     137,147  

2017

     132,070  

2018

     108,903  

Thereafter

     1,212,376  
       
​ ​ ​ ​ ​

 

   $ 1,812,785  
       
​ ​ ​ ​ ​
​ ​ ​ ​ ​
       
Future minimum rental commitments under non-cancelable leases

 

 

(In thousands)
   
  

2014

   $ 5,881  

2015

     4,985  

2016

     2,484  

2017

     825  

2018

     166  

Thereafter

     —  
       
​ ​ ​ ​ ​

 

   $ 14,341  
       
​ ​ ​ ​ ​
​ ​ ​ ​ ​