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, minimum future rental payments, exclusive of taxes and other charges, of these leases were:

Years Ending December 31,	(in thousands)
2018	$	10,994
2019	10,458
2020	8,730
2021	7,104
2022	6,303
Thereafter	14,482
Total minimum payments	$	58,071