Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Future Minimum Lease Payments Required under Operating Leases

Future minimum lease payments required under operating leases that have initial or remaining non-cancelable terms in excess of one year as of December 31, 2017 are as follows:

(In Thousands)	Total
2018	$	107,038
2019	91,317
2020	77,056
2021	58,282
2022	42,046
Thereafter	81,284
	$	457,023