Long-Term Debt and Notes Payable (Tables)

12 Months Ended

Dec. 31, 2011

Debt Instrument [Line Items]

Schedule of long-term debt

Long-term debt consisted of the following:

(in thousands)	December 31, 2011		December 31, 2010
Energen Corporation:
Medium-term Notes, Series A and B, interest ranging from 7.125% to 7.6%, for notes due July 30, 2012 to February 15, 2028	$	155,000	$	155,000
5% Notes, due October 1, 2013	50,000		50,000
4.625% Notes, due September 1, 2021	400,000		—
Senior Term Loans, (floating rate interest LIBOR plus 1.375%; currently 1.67% at December 31, 2011), due March 31, 2014 to November 29, 2016	300,000		—
Alabama Gas Corporation:
Medium-term Notes, Series A, interest of 7.57%	—		5,000
5.20% Notes, due January 15, 2020	40,000		40,000
5.70% Notes, due January 15, 2035	35,246		35,793
5.368% Notes, due December 1, 2015	80,000		80,000
5.90% Notes, due January 15, 2037	45,000		45,000
3.86% Notes, due December 21, 2021	50,000		—
Total	1,155,246		410,793
Less amounts due within one year	1,000		5,000
Less unamortized debt discount	546		539
Total	$	1,153,700	$	405,254

Schedule of aggregate maturities of long-term debt

The aggregate maturities of Energen's long-term debt for the next five years are as follows:

Years ending December 31, (in thousands)
2012	2013	2014	2015	2016
$1,000	$50,000	$100,000	$180,000	$100,000

Schedule of credit facilities

The following is a summary of information relating to the credit facilities:

(in thousands)	Current Term	Energen		Alagasco		Total
Syndicated Credit Facility	10/29/2013	$	850,000	$	150,000	$	1,000,000
Bryant Bank	10/31/2012	—		9,000		9,000
BancorpSouth Bank	5/23/2012	—		10,000		10,000
Total		$	850,000	$	169,000	$	1,019,000

(in thousands)	December 31, 2011			December 31, 2010
Energen outstanding	$	—		$	235,000
Alagasco outstanding	15,000			70,000
Notes payable to banks	15,000			305,000
Available for borrowings	1,004,000			714,000
Total	$	1,019,000		$	1,019,000
Energen maximum amount outstanding at any month-end	$	363,000		$	305,000
Energen average daily amount outstanding	$	229,094		$	19,732
Energen weighted average interest rates based on:
Average daily amount outstanding	2.04		%	2.07		%
Amount outstanding at year-end	3.58		%	2.03		%
Alagasco maximum amount outstanding at any month-end	$	70,000		$	70,000
Alagasco average daily amount outstanding	$	29,268		$	6,436
Alagasco weighted average interest rates based on:
Average daily amount outstanding	1.72		%	1.56		%
Amount outstanding at year-end	3.58		%	1.90		%

Alabama Gas Corporation

Debt Instrument [Line Items]

Schedule of aggregate maturities of long-term debt

The aggregate maturities of Alagasco's long-term debt for the next five years are as follows:

Years ending December 31, (in thousands)
2012	2013	2014	2015	2016
—	—	—	$80,000	—