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Commitments and contingent liabilities (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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