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Commitments and contingent liabilities (Tables)
12 Months Ended
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]  
Future Minimum Lease Payments Under Noncancelable Operating Leases
Future minimum lease payments as of December 31, 2016 under noncancellable operating leases are as follows:
 
Future Lease Payments
 
(Dollars in thousands)
2017
$
29,546

2018
23,224

2019
20,349

2020
16,887

2021
14,318

2022 and thereafter
36,664