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Commitments | 12 Months Ended
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Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract] |
Commitments | (11) Commitments Lease commitments under non-cancelable operating leases extending for one year or more will require the following future payments:
​ | ​ | ​ | ​
|  | (Dollars in thousands) |
​ | ​ | ​ | ​
2018 |  | $ | 2,180 |
2019 |  | 1,873 |
2020 |  | 773 |
2021 |  | 399 |
2022 |  | 314 |
After 2022 |  | 649 |
​ | ​ | ​ | ​
Total lease and rental expenses under non-cancelable operating leases extending one year or more approximated $5.3 million in 2017, $3.6 million in 2016 and $6.2 million in 2015.

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- Definition The entire disclosure for significant arrangements with third parties, which includes operating lease arrangements and arrangements in which the entity has agreed to expend funds to procure goods or services, or has agreed to commit resources to supply goods or services, and operating lease arrangements. Descriptions may include identification of the specific goods and services, period of time covered, minimum quantities and amounts, and cancellation rights. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -URI http://asc.fasb.org/topic&trid=2144648 + Details
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