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

12 Months Ended

Dec. 31, 2018

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:

	2018		2017
	(In thousands)
Unit credit agreement with average interest rate of 3.4% at December 31, 2017	$	—	$	178,000
Superior credit agreement	—		—
6.625% senior subordinated notes due 2021	650,000		650,000
Total principal amount	$	650,000	$	828,000
Less: unamortized discount	(1,623)		(2,234)
Less: debt issuance costs, net	(3,902)		(5,490)
Total long-term debt	$	644,475	$	820,276

Other Long Term Liabilities [Table Text Block]

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

	2018		2017
	(In thousands)
ARO liability	$	64,208	$	69,444
Workers’ compensation	12,738		13,340
Capital lease obligations	11,380		15,224
Contract liability	9,881		—
Separation benefit plans	8,814		6,524
Deferred compensation plan	5,132		5,390
Gas balancing liability	3,331		3,283
	115,484		113,205
Less current portion	14,250		13,002
Total other long-term liabilities	$	101,234	$	100,203

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

Future payments required under the capital leases at December 31, 2018 are as follows:

	Amount
Ending December 31,	(In thousands)
2019	$	6,168
2020	6,168
2021	3,768
Total future payments	16,104
Less payments related to:
Maintenance	4,089
Interest	635
Present value of future minimum payments	$	11,380