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Financial Instruments and Risk Management (Tables)
 12 Months Ended
Dec. 31, 2011
Derivative [Line Items]  
Schedule of changes in allowance for credit losses on Financing Receivables [Table Text Block]
The following table sets forth a summary of changes in the allowance for credit losses as follows:

(in thousands)
 
Allowance for credit losses as of December 31, 2010
$
447

Provision
(26
)
Allowance for credit losses as of December 31, 2011
$
421
Schedule of fair values of commodity contracts by business segment on balance sheet
The following table details the fair values of commodity contracts by business segment on the balance sheets:

(in thousands)
December 31, 2011
 
Oil and Gas Operations
 
Natural Gas Distribution

Total
Derivative assets or (liabilities) designated as hedging instruments
 
 
 
 
Accounts receivable
$
73,636

 
$
—

$
73,636

Long-term asset derivative instruments
75,982

 
—

75,982

Total derivative assets
149,618

 
—

149,618

Accounts receivable
(48,174
)
*
—

(48,174
)
Long-term asset derivative instruments
(36,341
)
*
—

(36,341
)
Accounts payable
(37,070
)
 
—

(37,070
)
Long-term liability derivative instruments
(20,386
)
 
—

(20,386
)
Total derivative liabilities
(141,971
)
 
—

(141,971
)
Total derivatives designated
7,647

 
—

7,647

Derivative assets or (liabilities) not designated as hedging instruments
 
 
 
Accounts receivable
(3,670
)
*
—

(3,670
)
Long-term asset derivative instruments
(8,585
)
*
—

(8,585
)
Total derivative assets
(12,255
)
 
—

(12,255
)
Accounts payable
(13,416
)
 
(56,804
)
(70,220
)
Long-term liability derivative instruments
(10,922
)
 
(3,070
)
(13,992
)
Total derivative liabilities
(24,338
)
 
(59,874
)
(84,212
)
Total derivatives not designated
(36,593
)
 
(59,874
)
(96,467
)
Total derivatives
$
(28,946
)
 
$
(59,874
)
$
(88,820
)

(in thousands)
December 31, 2010
 
Oil and Gas Operations
 
Natural Gas Distribution

Total
Derivative assets or (liabilities) designated as hedging instruments
 
 
 
 
Accounts receivable
$
85,867

 
$
—

$
85,867

Long-term derivative instruments
3,156

*
—

3,156

Total derivative assets
89,023

 
—

89,023

Accounts receivable
(25,315
)
*
—

(25,315
)
Accounts payable
(50,508
)
 
—

(50,508
)
Long-term liability derivative instruments
(83,631
)
 
—

(83,631
)
Total derivative liabilities
(159,454
)
 
—

(159,454
)
Total derivatives designated
(70,431
)
 
—

(70,431
)
Derivative assets or (liabilities) not designated as hedging instruments
 
 
 
Accounts payable
(110
)
 
(27,906
)
(28,016
)
Long-term liability derivative instruments
—

 
(32,461
)
(32,461
)
Total derivative liabilities
(110
)
 
(60,367
)
(60,477
)
Total derivatives not designated
(110
)
 
(60,367
)
(60,477
)
Total derivatives
$
(70,541
)
 
$
(60,367
)
$
(130,908
)
* Amounts classified in accordance with accounting guidance which permits offsetting fair value amounts recognized for multiple derivative instruments executed with the same counterparty under a master netting arrangement.
Schedule of cash flow hedging relationships on financial statements
The following table details the effect of derivative commodity instruments designated as hedging instruments on the financial statements:


Years ended December 31, (in thousands)
Location on Income Statement
2011
2010
Net gain recognized in OCI on derivative (effective portion), net of tax of $41.4 million and $19.5 million
—
$
67,546

$
31,801

Gain reclassified from accumulated OCI into
income (effective portion)

Operating revenues
$
26,326

$
200,324

Gain (loss) recognized in income on derivative (ineffective portion and amount excluded from effectiveness testing)

Operating revenues
$
(2,767
)
$
1,082
Schedule of derivatives not designated as hedging instruments on income statements

The following table details the effect of derivative commodity instruments not designated as hedging instruments on the income statements:


Years ended December 31, (in thousands)
Location on Income Statement
2011
2010
Loss recognized in income on derivative
Operating revenues
$
(37,587
)
$
(3
)
Schedule of hedging transactions
As of December 31, 2011, Energen Resources entered into the following transactions for 2012 and subsequent years:

Production Period
Total Hedged Volumes
Average Contract
Price

Description
Natural Gas
2012
11.0
 Bcf
$5.07 Mcf
NYMEX Swaps
 
29.5
 Bcf
$4.60 Mcf
Basin Specific Swaps
2013
8.8
 Bcf
$5.30 Mcf
NYMEX Swaps
 
25.1
 Bcf
$4.88 Mcf
Basin Specific Swaps
2014
3.0
 Bcf
$5.72 Mcf
NYMEX Swaps
 
16.8
 Bcf
$5.16 Mcf
Basin Specific Swaps
Oil
2012
6,762
 MBbl
$88.29 Bbl
NYMEX Swaps
2013
7,643
 MBbl
$90.03 Bbl
NYMEX Swaps
2014
5,612
 MBbl
$90.56 Bbl
NYMEX Swaps
Oil Basis Differential
2012
3,124
 MBbl
*
Basis Swaps
2013
2,768
 MBbl
*
Basis Swaps
Natural Gas Liquids
2012
58.5
 MMGal
$0.98 Gal
Liquids Swaps
2013
44.5
 MMGal
$1.02 Gal
Liquids Swaps
* Average contract prices not meaningful due to the varying nature of each contract
Schedule of fair value, assets and liabilities measured on recurring basis
The following sets forth derivative assets and liabilities that were measured at fair value on a recurring basis:

 
December 31, 2011
(in thousands)
Level 2*
Level 3*
Total
Current assets
$
(14,843
)
$
36,635

$
21,792

Noncurrent assets
(8,382
)
39,438

31,056

Current liabilities
(98,468
)
(8,822
)
(107,290
)
Noncurrent liabilities
(32,928
)
(1,450
)
(34,378
)
Net derivative asset (liability)
$
(154,621
)
$
65,801

$
(88,820
)

 
December 31, 2010
(in thousands)
Level 2*
Level 3*
Total
Current assets
$
10,316

$
50,236

$
60,552

Current liabilities
(76,527
)
(1,997
)
(78,524
)
Noncurrent liabilities
(107,452
)
(5,484
)
(112,936
)
Net derivative asset (liability)
$
(173,663
)
$
42,755

$
(130,908
)
* Amounts classified in accordance with accounting guidance which permits offsetting fair value amounts recognized for multiple derivative instruments executed with the same counterparty under a master netting arrangement.
Schedule of changes in fair value of derivative instruments classified as level 3
The table below sets forth a summary of changes in the fair value of the Company’s Level 3 derivative commodity instruments as follows:

Years ended December 31, (in thousands)
2011
2010
2009
Balance at beginning of period
$
42,755

$
64,517

$
154,094

Realized gains (losses)
(6,180
)
(241
)
13

Unrealized gains relating to instruments held at the reporting date
79,882

90,580

65,015

Purchases and settlements during period
(50,656
)
(112,101
)
(154,605
)
Balance at end of period
$
65,801

$
42,755

$
64,517
Alabama Gas Corporation
  
Derivative [Line Items]  
Schedule of hedging transactions
Alagasco entered into the following natural gas transactions for 2012 and subsequent years:

Production Period
Total Hedged Volumes
Description
2012
17.2
 Bcf
NYMEX Swaps
2013
1.5
 Bcf
NYMEX Swaps