LONG-TERM DEBT (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Schedule of Long-Term Debt

Long-term debt consisted of the following:

(in thousands)	December 31, 2017		December 31, 2016
Credit facility, due August 30, 2019	$	255,000	$	—
7.40% Medium-term Notes, Series A, due July 24, 2017	—		2,000
7.36% Medium-term Notes, Series A, due July 24, 2017	—		15,000
7.23% Medium-term Notes, Series A, due July 28, 2017	—		2,000
7.32% Medium-term Notes, Series A, due July 28, 2022	20,000		20,000
7.60% Medium-term Notes, Series A, due July 26, 2027	—		5,000
7.35% Medium-term Notes, Series A, due July 28, 2027	10,000		10,000
7.125% Medium-term Notes, Series B, due February 15, 2028	100,000		100,000
4.625% Notes, due September 1, 2021	400,000		400,000
Total	785,000		554,000
Less amounts due within one year	—		24,000
Less unamortized debt discount	360		387
Less unamortized debt issuance costs	1,779		2,170
Total	$	782,861	$	527,443

Schedule of Aggregate Maturities of Long-Term Debt

The aggregate maturities of Energen’s long-term debt as of December 31, 2017 are as follows:

Years ending December 31, (in thousands)
2018	2019	2020	2021	2022	Thereafter
$—	$255,000	$—	$400,000	$20,000	$110,000

Schedule of Credit Facilities

The following is a summary of information relating to Energen’s credit facility:

(in thousands)	December 31, 2017		December 31, 2016
Credit facility outstanding	$	255,000	$	—
Available for borrowings	795,000		1,050,000
Total borrowing commitments	$	1,050,000	$	1,050,000

Years ended December 31, (in thousands)	2017			2016			2015
Maximum amount outstanding at any month-end	$	285,500		$	214,500		685,000
Average daily amount outstanding	$	131,822		$	33,642		358,929
Weighted average interest rates based on:
Average daily amount outstanding	2.54		%	1.72		%	1.60	%
Amount outstanding at year-end	2.77		%	—		%	1.64	%