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Basis of Presentation and Significant Accounting Policies Tables (Tables)
 12 Months Ended
Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Impairment of Proved Oil and Natural Gas Properties
Based on the analysis described above, the Company recorded the following noncash impairment charges (before and after tax) associated with proved oil and natural gas properties:
 
Year Ended December 31,
 
2015
 
2014
 
2013
 
(in thousands)
 
 
 
 
 
 
Rockies region
$
1,758,939

 
$
585,705

 
$
—

Hugoton Basin region
1,667,768

 
—

 
—

California region
537,511

 
22

 
—

TexLa region
430,859

 
4,836

 
—

Mid-Continent region
405,370

 
244,413

 
828,317

Permian Basin region
71,990

 
1,337,444

 
—

South Texas region
42,433

 
131,329

 
—

 
$
4,914,870

 
$
2,303,749

 
$
828,317
Impairment of Unproved Oil and Natural Gas Properties
The Company recorded the following noncash impairment charges (before and after tax) associated with unproved oil and natural gas properties:
 
Year Ended
December 31, 2015
 
(in thousands)
 
 
TexLa region
$
416,846

Permian Basin region
226,922

Rockies region
184,137

California region
71,179

 
$
899,084