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PROPERTIES AND EQUIPMENT Properties and Equipment (Tables)
 12 Months Ended
Dec. 31, 2013
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment [Table Text Block]
The following table presents the components of properties and equipment, net of accumulated DD&A:

 
As of December 31,
 
2013
 
2012
 
(in thousands)
Properties and equipment, net:
 
 
 
Crude oil and natural gas properties
 
 
 
Proved
$
1,781,681

 
$
2,075,924

Unproved
307,203

 
319,327

Total crude oil and natural gas properties
2,088,884

 
2,395,251

Pipelines and related facilities
21,781

 
47,786

Equipment and other
29,246

 
34,858

Land and buildings
13,617

 
14,935

Construction in progress
53,810

 
67,217

Gross properties and equipment
2,207,338

 
2,560,047

Accumulated DD&A
(553,893
)
 
(943,341
)
Properties and equipment, net
$
1,653,445

 
$
1,616,706

 
 
 
 
Impairment of natural gas and crude oil properties [Table Text Block]
The following table presents impairment charges recorded for crude oil and natural gas properties:

 
Year Ended December 31,
 
2013
 
2012
 
2011
 
(in thousands)
Continuing operations:
 
 
 
 
 
Impairment of proved properties
$
48,750

 
$
—

 
$
—

Impairment of individually significant unproved properties
1,082

 
1,629

 
1,108

Amortization of individually insignificant unproved properties
3,603

 
4,266

 
1,193

Total continuing operations
53,435

 
5,895

 
2,301

Discontinued operations:
 
 
 
 
 
Impairment of proved properties
—

 
161,185

 
22,460

Impairment of individually significant unproved properties
—

 
313

 
—

Amortization of individually insignificant unproved properties
3

 
756

 
398

Total discontinued operations
3

 
162,254

 
22,858

Total impairment of crude oil and natural gas properties
$
53,438

 
$
168,149

 
$
25,159

 
 
 
 
 
 
Capitalized Exploratory Well Costs, Roll Forward [Table Text Block]
The following table presents the capitalized exploratory well costs pending determination of proved reserves, and included in properties and equipment on the consolidated balance sheets:


2013
 
2012
 
2011

(in thousands, except for number of wells)

 
 
 
 
 
Balance beginning of year, January 1,
$
19,567

 
$
4,432

 
$
2,297

Additions to capitalized exploratory well costs pending the determination of proved reserves
13,424

 
30,482

 
3,692

Reclassifications to wells, facilities and equipment based on the determination of proved reserves
(32,991
)
 
—

 
(1,557
)
Capitalized exploratory well costs charged to expense
—

 
(15,347
)
 
—

Balance end of year, December 31,
$
—

 
$
19,567

 
$
4,432


 
 
 
 
 
Number of wells pending determination at December 31,
—

 
2

 
6

 
 
 
 
 
 
Schedule of Aging of Capitalized Exploratory Well Costs [Table Text Block]
The following table presents an aging of capitalized exploratory well costs based on the date that drilling commenced and the number of projects for which exploratory well costs have been capitalized for a period greater than one year since the commencement of drilling:
 
As of December 31,
 
2012
 
2011
 
(in thousands)
 
 
 
 
Exploratory well costs capitalized for a period of one year or less
$
19,567

 
$
3,587

Exploratory well costs capitalized for a period greater than one year since commencement of drilling
—

 
845

Balance end of year, December 31,
$
19,567

 
$
4,432

Number of projects with exploratory well costs that have been capitalized for a period greater than one year since commencement of drilling
—

 
2