Commitments and contingent liabilities (Tables)

12 Months Ended

Dec. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

Future Minimum Lease Payments Under Noncancelable Operating Leases

Future minimum lease payments as of December 31, 2015 under noncancelable operating leases are as follows:

	Future Lease Payments
	(Dollars in thousands)
2016	$	30,191
2017	26,299
2018	19,087
2019	15,746
2020	15,274
2021 and thereafter	13,510