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Commitments and Contingencies (Tables) | 6 Months Ended
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Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract] |
Components of Lease Expense | The components of lease expense were as follows:
| Three months ended June 30, |  | Six months ended June 30,
(dollars in thousands) | 2021 | 2020 |  | 2021 | 2020
Operating lease cost(1) | $ | 2,372 |  | $ | 6,281 |  |  | $ | 5,213 |  | $ | 12,592 |
Variable lease cost | 699 |  | 1,113 |  |  | 1,398 |  | 2,371 |
Sublease income | (366) |  | (940) |  |  | (826) |  | (1,853) |
Net lease cost | $ | 2,705 |  | $ | 6,454 |  |  | $ | 5,785 |  | $ | 13,110 |
(1)Includes short-term lease costs, which were immaterial.

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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 + Details
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