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Leases (Tables) | 12 Months Ended
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Dec. 31, 2020
Leases [Abstract] |
Components of Lease Cost | The components of lease costs were as follows for the years ended December 31, 2020 and 2019 (in thousands)
| 2019 |  | 2020
Lease Cost: |  |  |
Operating lease cost(1) | $ | 35,335 |  |  | $ | 28,337 |
Short-term lease cost | 885 |  |  | 534 |
Sublease income | (2,696) |  |  | (2,240) |
Total lease costs | $ | 33,524 |  |  | $ | 26,631 |
___________________________________________________________ (1)During the years ended December 31, 2019 and 2020, operating lease cost includes $6.0 million and $0.8 million of right-of-use lease asset impairment charges, respectively, related to redundant leased space that was vacated during the year. Prior to the adoption of ASU 2016-02 in the first quarter of 2019, the Company recognized minimum rental expense on a straight-line basis over the lease term. Rent expense was $35.9 million for the year ended December 31, 2018 . The following table provides a summary of the Company's average lease term and discount rate as of December 31, 2019 and 2020:
| As of December 31, 2019 |  | As of December 31, 2020
Weighted average remaining lease term (years) | 5.7 |  | 5.6
Weighted average discount rate | 4.15 | % |  | 4.37 | %
Supplemental information related to the Company's leases for the years ended December 31, 2019 and 2020 (in thousands):
| Year ended December 31, 2019 |  | Year ended December 31, 2020
Cash paid for amounts included in the measurement of lease liabilities | $ | 32,883 |  |  | $ | 32,510 |
Right-of-use assets obtained in exchange for operating lease liabilities | $ | 4,431 |  |  | $ | 12,763 |
Maturities of Lease Liabilities | Maturities of lease liabilities (in thousands):
Year Ending December 31, |
2021 | $ | 40,336 |
2022 | 27,683 |
2023 | 22,548 |
2024 | 19,512 |
2025 | 15,011 |
Thereafter | 34,898 |
Total lease payments(1) | 159,988 |
Less: interest | (19,028) |
Present value of lease liabilities | $ | 140,960 |
__________________________________________________________ (1)Excludes $60.0 million of legally binding minimum payments for leases signed but not yet commenced.

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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=121609121&loc=SL77918686-209980 + Details
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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=121609121&loc=SL77918701-209980 + Details
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