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

6 Months Ended

Jun. 30, 2018

Debt Disclosure [Abstract]

Long-Term Debt

Our long-term debt as of the dates indicated consisted of the following:

	June 30, 2018			December 31, 2017
	(In thousands)
Unit credit agreement with an 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	(1,933		)	(2,234		)
Less: debt issuance costs, net	(4,696		)	(5,490		)
Total long-term debt	$	643,371		$	820,276

Other Long-Term Liabilities

Other long-term liabilities consisted of the following:

	June 30, 2018		December 31, 2017
	(In thousands)
Asset retirement obligation (ARO) liability	$	62,838	$	69,444
Capital lease obligations	13,321		15,224
Workers’ compensation	12,963		13,340
Contract liability	11,331		—
Separation benefit plans	7,607		6,524
Deferred compensation plan	5,621		5,390
Gas balancing liability	3,283		3,283
	116,964		113,205
Less current portion	14,036		13,002
Total other long-term liabilities	$	102,928	$	100,203

Capital leases

Future payments required under the capital leases at June 30, 2018 are:

	Amount
Beginning July 1,	(In thousands)
2018	$	6,168
2019	6,168
2020	6,673
2021	179
Total future payments	19,188
Less payments related to:
Maintenance	4,981
Interest	886
Present value of future minimum payments	$	13,321