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LEASES (Tables) | 6 Months Ended
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Jun. 30, 2020
LEASES |
Components of operating lease cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30,
​ |  | 2020 |  | 2019 |  | 2020 |  | 2019
Operating lease cost | ​ | $ | 4,860 | ​ | $ | 2,000 | ​ | $ | 9,694 | ​ | $ | 3,850
Short-term and variable lease cost | ​ | ​ | 1,339 | ​ | ​ | 743 | ​ | ​ | 2,647 | ​ | ​ | 1,689
Total operating lease cost | ​ | $ | 6,199 | ​ | $ | 2,743 | ​ | $ | 12,341 | ​ | $ | 5,539
Schedule of maturities of operating lease liabilities | ​
​ | ​ | ​ | ​
Year Ending December 31, |  | ​ |
2020 (remaining) | ​ | $ | 11,823
2021 | ​ |  | 21,278
2022 | ​ |  | 14,722
2023 | ​ |  | 11,685
2024 | ​ | ​ | 10,474
Thereafter | ​ | ​ | 71,016
Total lease payments | ​ | ​ | 140,998
Less: Interest | ​ | ​ | (29,273)
Present value of lease liabilities | ​ | $ | 111,725
Schedule of other information related to leases | Other information related to leases, including supplemental cash flow information, consists of: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30,
​ |  |  | 2020 |  | 2019 |  | 2020 |  | 2019
Cash paid for operating leases | ​ | ​ | $ | 5,828 | ​ | $ | 3,023 | ​ | $ | 11,402 | ​ | $ | 5,914
Right-of-use assets obtained in exchange for operating lease liabilities(1) | ​ | ​ | $ | 2,270 | ​ | $ | 19,244 | ​ | $ | 24,478 | ​ | $ | 57,555
(1) In the three months ended March 31, 2019 we implemented ASC 842, Leases. The previously reported amount includes leases existing on January 1, 2019.

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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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