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Costs Incurred for Property Acquisition, Exploration and Development (Tables)
 9 Months Ended
Sep. 30, 2013
Costs Incurred for Property Acquisition, Exploration and Development

 

Nine
Months Ended
September 30,
2013

 

 

Year
Ended
December 31,
2012

 

 

(in thousands)

 

Acreage purchases

$

  69,987

 

  

$

  188,843

 

Development

 

  727,386

 

  

 

  1,049,129

 

Exploration:

 

 

 

  

 

 

 

Drilling

 

  173,298

 

  

 

  309,816

 

Expense

 

  47,331

 

  

 

  65,758

 

Stock-based compensation expense

 

  3,013

 

  

 

  4,049

 

Gas gathering facilities:

 

 

 

  

 

 

 

Development

 

  40,626

 

  

 

  41,035

 

Subtotal

 

  1,061,641

 

  

 

  1,658,630

 

Asset retirement obligations

 

(964

)

  

 

  57,982

 

Total costs incurred

$

  1,060,677

 

  

$

  1,716,612

 

(a)              Includes cost incurred whether capitalized or expensed.