Commitments and Contingent Liabilities (Tables)

12 Months Ended

Dec. 31, 2017

Commitments And Contingencies Disclosure [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases

As of December 31, 2017, the minimum aggregate rental commitments for operating leases were as follows:

		December 31, 2017
		(In thousands)
	2018	$	6,985
	2019		7,111
	2020		6,552
	2021		6,415
	2022		6,516
Thereafter			37,949
Total minimum rental commitments for operating leases		$	71,528