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Leases (Tables)
 9 Months Ended
Sep. 30, 2019
Leases [Abstract]  
Assets and liabilities, lease
Operating lease right-of-use assets and lease liabilities are as follows (dollar amounts in thousands):

September 30,
2019		January 1,
2019
Assets:
Operating lease right-of-use assets$24,890  $23,143  
Liabilities:
Current$5,050  $4,426  
Long-term21,061  19,566  
Total operating lease liabilities$26,111  $23,992  
Lessee, operating lease, liability, maturity
The approximate aggregate commitments under non-cancelable operating leases in effect at September 30, 2019 and December 31, 2018, were as follows (dollar amounts in thousands):

September 30,
2019		December 31,
2018
2019$1,567  $5,646  
20205,800  4,692  
20214,925  3,864  
20223,500  2,367  
20233,014  2,162  
Thereafter11,705  10,296  
Total lease payments$30,511  $29,027  
Less: Imputed interest (1)4,400  
Present value of lease liabilities$26,111  

(1) Calculated using our corporate borrowing rate based on the term of each lease ranging from 4.09 percent to 4.29 percent.