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Lease Commitments (Tables) | 12 Months Ended
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Dec. 31, 2017
Leases, Operating [Abstract] |
Future Minimum Lease Payments under Operating Leases | The following is a schedule by calendar year of future minimum lease payments under operating leases that have remaining terms as of December 31, 2017:
Period/Year |  | Operating Leases
|  | (in thousands)
2018 |  | $ | 2,482 |
2019 |  | 1,968 |
2020 |  | 1,489 |
2021 |  | 734 |
2022 |  | 735 |
Thereafter |  | 1,710 |
Total minimum lease payments |  | $ | 9,118 |
Operating Leases Expense | Total expense for all operating leases for the years ended December 31, 2017, 2016 and 2015 was as follows:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (in thousands)
Operating lease expense | $ | 3,833 |  |  | $ | 2,615 |  |  | $ | 2,003 |

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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=77902758&loc=d3e41502-112717 + Details
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