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Commitments
12 Months Ended
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.