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Leases (Tables) | 9 Months Ended
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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-term | 21,061 |  |  | 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 |
2020 | 5,800 |  |  | 4,692 |
2021 | 4,925 |  |  | 3,864 |
2022 | 3,500 |  |  | 2,367 |
2023 | 3,014 |  |  | 2,162 |
Thereafter | 11,705 |  |  | 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.

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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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