Long-Term Debt And Other Long-Term Liabilities (Tables)

12 Months Ended

Dec. 31, 2016

Long-term debt and other long-term liabilites [Abstract]

Long Term Debt [Table Text Block]

Long-term debt consisted of the following as of December 31:

	2016			2015
	(In thousands)
Credit agreement with average interest rates of 2.8% and 2.6% at December 31, 2016 and 2015, respectively	$	160,800		$	281,000
6.625% senior subordinated notes due 2021	650,000			650,000
Total principal amount	$	810,800		$	931,000
Less: unamortized discount	(2,804		)	(3,338		)
Less: debt issuance costs, net	(7,079		)	(8,667		)
Total long-term debt	$	800,917		$	918,995

Other Long Term Liabilities [Table Text Block]

Other long-term liabilities consisted of the following as of December 31:

	2016		2015
	(In thousands)
ARO liability	$	70,170	$	98,297
Capital lease obligations	18,918		22,466
Workers’ compensation	15,163		16,551
Separation benefit plans	4,943		9,886
Deferred compensation plan	4,578		4,244
Gas balancing liability	3,789		5,047
Other	410		410
	117,971		156,901
Less current portion	14,907		16,560
Total other long-term liabilities	$	103,064	$	140,341

Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block]

Future payments required under the capital leases at December 31, 2016 are as follows:

	Amount
Ending December 31,	(In thousands)
2017	$	6,168
2018	6,168
2019	6,168
2020	6,168
2021	3,769
Total future payments	28,441
Less payments related to:
Maintenance	7,659
Interest	1,864
Present value of future minimum payments	$	18,918