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Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments And Contingencies Disclosure [Abstract]

Future minimum rental payments under operating leases that have initial noncancelable lease terms in excess of one year, as of December 31, 2017, are as follows:

	(in thousands)
Year
2018	$	83,684
2019		73,524
2020		61,776
2021		47,348
2022		33,292
Thereafter		67,459
	$	367,083