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LEASES (Tables) | 6 Months Ended
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Jun. 30, 2021
LEASES |
Components of operating lease cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30,
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020
Operating lease cost | ​ | $ | 6,052 | ​ | $ | 4,860 | ​ | $ | 11,973 | ​ | $ | 9,694
Short-term and variable lease cost | ​ | ​ | 284 | ​ | ​ | 1,339 | ​ | ​ | 1,126 | ​ | ​ | 2,647
Total operating lease cost | ​ | $ | 6,336 | ​ | $ | 6,199 | ​ | $ | 13,099 | ​ | $ | 12,341
Schedule of maturities of operating lease liabilities | ​
​ | ​ | ​ | ​
Year Ending December 31, |  | ​ | ​
2021 (remaining) | ​ | $ | 10,562
2022 | ​ |  | 18,568
2023 | ​ |  | 15,284
2024 | ​ |  | 12,967
2025 | ​ | ​ | 10,769
Thereafter | ​ | ​ | 74,927
Total lease payments | ​ | ​ | 143,077
Less: Interest | ​ | ​ | (32,503)
Present value of lease liabilities | ​ | $ | 110,574
Schedule of other information related to leases | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | ​ | December 31, | ​
​ |  | 2021 |  |  | 2020 | ​
Weighted average remaining lease term (in years) | ​ | ​ | 10.25 | ​ | ​ | ​ | 10.65 | ​
Weighted average discount rate | ​ |  | 4.58 | % | ​ | ​ | 4.63 | %
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Three Months Ended June 30, | ​ | Six Months Ended June 30, | ​
​ | 2021 |  | 2020 |  | 2021 |  | 2020 | ​
Cash paid for operating leases | $ | 6,021 | ​ | $ | 5,828 | ​ | $ | 11,979 | ​ | $ | 11,402 | ​
Right-of-use assets obtained in exchange for operating lease liabilities | $ | 5,040 | ​ | $ | 2,270 | ​ | $ | 7,232 | ​ | $ | 24,478 | ​

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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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