Contingencies And Contractual Commitments (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Contractual Obligation, Fiscal Year Maturity Schedule

At December 31, 2017, the minimum future transportation and storage fees under transportation agreements having terms in excess of one year are as follows:

	(In thousands)
2018	$	148,716
2019	132,547
2020	119,639
2021	107,400
2022	102,884
Thereafter	857,454
Total	$	1,468,640