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LEASES (Tables) | 3 Months Ended
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Mar. 31, 2021
LEASES |
Components of operating lease cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31,
​ |  | 2021 |  | 2020
Operating lease cost | ​ | $ | 5,921 | ​ | $ | 4,834
Short-term and variable lease cost | ​ | ​ | 842 | ​ | ​ | 1,308
Total operating lease cost | ​ | $ | 6,763 | ​ | $ | 6,142
Schedule of maturities of operating lease liabilities | ​
​ | ​ | ​ | ​
Year Ending December 31, |  | ​ | ​
2021 (remaining) | ​ | $ | 15,482
2022 | ​ |  | 16,723
2023 | ​ |  | 13,503
2024 | ​ |  | 12,120
2025 | ​ | ​ | 10,664
Thereafter | ​ | ​ | 74,413
Total lease payments | ​ | ​ | 142,905
Less: Interest | ​ | ​ | (33,375)
Present value of lease liabilities | ​ | $ | 109,530
Schedule of other information related to leases | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31, | ​
​ |  | 2021 |  | 2020 | ​
Weighted average remaining lease term (in years) | ​ | ​ | 10.6 | ​ | ​ | 9.7 | ​
Weighted average discount rate | ​ | ​ | 4.6 | % | ​ | 4.3 | %
Cash paid for operating leases | ​ | $ | 5,958 | ​ | $ | 5,574 | ​
Right-of-use assets obtained in exchange for operating lease liabilities | ​ | $ | 2,192 | ​ | $ | 22,208 | ​

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- Definition Tabular disclosure of other information relating to operating leases. + References No definition available. + Details
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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=77888426&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=77888426&loc=SL77918701-209980 + Details
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