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Property and Equipment
12 Months Ended
Dec. 31, 2014
Property, Plant and Equipment [Abstract]  
Property and Equipment
Property and Equipment

The major components of property and equipment, at cost, are as follows:
 
 
 
Estimated Useful Life
 
December 31,
 
 
 
2013
 
2014
 
 
Years
 
(In thousands)
Oil and gas properties
 
—

 
$
564,755

 
$
716,922

Equipment and other
 
3-39

 
17,237

 
18,608

Drilling rig
 
15

 
21,722

 
22,075

 
 
 

 
$
603,714

 
$
757,605