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Supplemental Cash Flow Information (Tables)
12 Months Ended
Dec. 31, 2011
Supplemental Cash Flow Information [Line Items]  
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
Supplemental information concerning Energen's cash flow activities was as follows:

Years ended December 31, (in thousands)
2011
2010
2009
Interest paid, net of amount capitalized
$
31,023

$
37,071

$
37,032

Income taxes paid
$
9,432

$
83,894

$
48,061

Noncash investing activities:
 
 
 
Accrued development and exploration costs
$
72,030

$
75,167

$
46,107

Capitalized depreciation
$
93

$
116

$
94

Capitalized asset retirement obligations costs
$
4,927

$
4,194

$
18,113

Allowance for funds used during construction
$
807

$
808

$
1,106

Noncash financing activities:
 
 
 
Issuance of common stock for employee benefit plans
$
822

$
5,765

$
641

Treasury stock acquired in connection with tax withholdings
$
713

$
2,894

$
778

Alabama Gas Corporation
 
Supplemental Cash Flow Information [Line Items]  
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
Supplemental information concerning Alagasco's cash flow activities was as follows:

Years ended December 31, (in thousands)
2011
2010
2009
Interest paid, net of amount capitalized
$
12,385

$
11,653

$
11,731

Income taxes paid
$
5,143

$
13,063

$
7,908

Interest on affiliated company debt, net
$
376

$
274

$
221

Noncash investing activities:
 
 
 
Accrued property, plant and equipment costs
$
2,229

$
2,592

$
2,049

Capitalized depreciation
$
93

$
116

$
94

Capitalized asset retirement obligations costs
$
300

$
161

$
229

Allowance for funds used during construction
$
807

$
808

$
1,106