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DERIVATIVE FINANCIAL INSTRUMENTS Derivative Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2012
Derivative Instruments Not Designated as Hedging Instruments [Abstract]  
Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]
The following table presents the location and fair value amounts of our derivative instruments on the balance sheets as of December 31, 2012 and 2011:
 
Derivatives instruments:
 
Balance sheet line item
 
2012
 
2011
 
 
 
 
 
(in thousands)
Derivative assets:
Current
 
 
 
 
 
 
 
Commodity contracts
 
 
 
 
 
 
 
Related to natural gas and crude oil sales
 
Fair value of derivatives
 
$
47,016

 
$
51,220

 
Related to affiliated partnerships (1)
 
Fair value of derivatives
 
4,707

 
8,018

 
Related to natural gas marketing
 
Fair value of derivatives
 
302

 
1,528

 
Basis protection contracts
 
 
 
 
 
 
 
Related to natural gas marketing
 
Fair value of derivatives
 
17

 
43

 
 
 
 
 
52,042

 
60,809

 
Non Current
 
 
 
 
 
 
 
Commodity contracts
 
 
 
 
 
 
 
Related to natural gas and crude oil sales
 
Fair value of derivatives
 
6,671

 
34,938

 
Related to affiliated partnerships (1)
 
Fair value of derivatives
 
—

 
6,134

 
Related to natural gas marketing
 
Fair value of derivatives
 
203

 
103

 
Basis protection contracts
 
 
 
 
 
 
 
Related to natural gas marketing
 
Fair value of derivatives
 
9

 
—

 
 
 
 
 
6,883

 
41,175

Total derivative assets
 
 
 
 
$
58,925

 
$
101,984

 
 
 
 
 
 
 
 
Derivative liabilities:
Current
 
 
 
 
 
 
 
Commodity contracts
 
 
 
 
 
 
 
Related to natural gas and crude oil sales
 
Fair value of derivatives
 
$
1,744

 
$
7,498

 
Related to affiliated partnerships (2)
 
Fair value of derivatives
 
—

 
211

 
Related to natural gas marketing
 
Fair value of derivatives
 
226

 
1,384

 
Basis protection contracts
 
 
 
 
 
 
 
Related to natural gas and crude oil sales
 
Fair value of derivatives
 
14,329

 
15,762

 
Related to affiliated partnerships (2)
 
Fair value of derivatives
 
2,140

 
3,116

 
Related to natural gas marketing
 
Fair value of derivatives
 
—

 
3

 
 
 
 
 
18,439

 
27,974

 
Non Current
 
 
 
 
 
 
 
Commodity contracts
 
 
 
 
 
 
 
Related to natural gas and crude oil sales
 
Fair value of derivatives
 
9,969

 
4,357

 
Related to affiliated partnerships (2)
 
Fair value of derivatives
 
—

 
113

 
Related to natural gas marketing
 
Fair value of derivatives
 
168

 
93

 
Basis protection contracts
 
 
 
 
 
 
 
Related to natural gas and crude oil sales
 
Fair value of derivatives
 
—

 
13,820

 
Related to affiliated partnerships (2)
 
Fair value of derivatives
 
—

 
2,723

 
 
 
 
 
10,137

 
21,106

Total derivative liabilities
 
 
 
 
$
28,576

 
$
49,080

__________
(1)
Represents derivative positions designated to our affiliated partnerships. Accordingly, our accompanying balance sheets include a corresponding payable to our affiliated partnerships representing their proportionate share of the derivative assets.
(2)
Represents derivative positions designated to our affiliated partnerships. Accordingly, our accompanying balance sheets include a corresponding receivable from our affiliated partnerships representing their proportionate share of the derivative liabilities.

    
The following table presents the impact of our derivative instruments on our statements of operations:


 
Year Ended December 31,

 
2012
 
2011
 
2010
Statement of operations line item
 
Reclassification
of Realized
Gains (Losses)
Included in Prior Periods
Unrealized
 
Realized and Unrealized
Gains
(Losses) For
the
Current
Period
 
Total
 
Reclassification
of Realized
Gains (Losses)
Included in Prior Periods
Unrealized
 
Realized and Unrealized
Gains
(Losses) For
the
Current
Period
 
Total
 
Reclassification
of Realized
Gains (Losses)
Included in Prior Periods
Unrealized
 
Realized and Unrealized
Gains
(Losses) For
the
Current
Period
 
Total

 
(in thousands)
Commodity price risk management gain (loss), net
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Realized gains
 
$
28,819

 
$
20,597

 
$
49,416

 
$
10,329

 
$
6,914

 
$
17,243

 
$
20,148

 
$
26,947

 
$
47,095

Unrealized gains (losses)
 
(28,819
)
 
11,742

 
(17,077
)
 
(10,329
)
 
39,176

 
28,847

 
(20,148
)
 
32,944

 
12,796

Total commodity price risk management gain, net
 
$
—

 
$
32,339

 
$
32,339

 
$
—

 
$
46,090

 
$
46,090

 
$
—

 
$
59,891

 
$
59,891

Sales from natural gas marketing
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Realized gains
 
$
1,571

 
$
599

 
$
2,170

 
$
1,827

 
$
1,143

 
$
2,970

 
$
2,390

 
$
3,991

 
$
6,381

Unrealized gains (losses)
 
(1,571
)
 
(87
)
 
(1,658
)
 
(1,827
)
 
1,666

 
(161
)
 
(2,390
)
 
1,745

 
(645
)
Total sales from natural gas marketing
 
$
—

 
$
512

 
$
512

 
$
—

 
$
2,809

 
$
2,809

 
$
—

 
$
5,736

 
$
5,736

Cost of natural gas marketing
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Realized losses
 
$
(1,387
)
 
$
(642
)
 
$
(2,029
)
 
$
(1,441
)
 
$
(1,130
)
 
$
(2,571
)
 
$
(1,905
)
 
$
(3,996
)
 
$
(5,901
)
Unrealized gains (losses)
 
1,387

 
214

 
1,601

 
1,441

 
(1,526
)
 
(85
)
 
1,905

 
(1,431
)
 
474

Total cost of natural gas marketing
 
$
—

 
$
(428
)
 
$
(428
)
 
$
—

 
$
(2,656
)
 
$
(2,656
)
 
$
—

 
$
(5,427
)
 
$
(5,427
)