Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments And Contingencies Disclosure [Abstract]

Summary of Minimum Rental Commitments under Operating Leases

Minimum rental commitments as of December 31, 2017 under such operating leases were as follows (in thousands):

2018	$	5,000
2019		9,659
2020		10,770
2021		10,149
2022		9,129
2023 and thereafter		99,166
	$	143,873