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Properties and Equipment
6 Months Ended
Jun. 30, 2012
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Disclosure [Text Block]
PROPERTIES AND EQUIPMENT

The following table presents the components of properties and equipment, net of depreciation and assets held-for-sale:

 
June 30, 2012
 
December 31, 2011
 
(in thousands)
Properties and equipment, net:
 
 
 
Natural gas and crude oil properties
 
 
 
Proved
$
1,931,754

 
$
1,694,694

Unproved
331,729

 
102,466

Total natural gas and crude oil properties
2,263,483

 
1,797,160

Pipelines and related facilities
42,237

 
40,721

Transportation and other equipment
33,224

 
32,475

Land and buildings
14,954

 
14,572

Construction in progress
52,476

 
69,633

Gross properties and equipment
2,406,374

 
1,954,561

Accumulated depreciation, depletion and amortization
(725,963
)
 
(652,845
)
Properties and equipment, net
$
1,680,411

 
$
1,301,716