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LEASES (Tables) | 12 Months Ended
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Dec. 31, 2020
LEASES |
Schedule of lease cost and other information | The components of lease expense were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​
​ | ​ | 2020 |  | 2019 |
​ | ​ | (in thousands) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Finance lease cost: | ​ | ​ | ​ | ​ | $ | ​ | ​
Amortization of right-of-use assets | ​ | $ | 704 | ​ |  | 14,608 | ​
Interest on lease liabilities | ​ |  | 377 | ​ |  | 2,085 | ​
Operating lease cost | ​ |  | 3,873 | ​ |  | 9,169 | ​
Short-term lease cost | ​ | ​ | 84 | ​ | ​ | 464 | ​
Variable lease cost | ​ |  | 1,375 | ​ |  | 1,360 | ​
Total lease cost | ​ | $ | 6,413 | ​ | $ | 27,686 | ​
Supplemental cash flow information related to leases was as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​
​ | ​ | 2020 |  | 2019 |
​ | ​ | (in thousands) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash paid for amounts included in the measurement of lease liabilities: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Operating cash flows for operating leases | ​ | $ | 3,870 | ​ |  | 9,124 | ​
Operating cash flows for finance leases | ​ | $ | 377 | ​ |  | 891 | ​
Financing cash flows for finance leases | ​ | $ | 8,368 | ​ |  | 46,725 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Right-of-use assets obtained in exchange for lease obligations: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Operating leases | ​ | $ | 278 | ​ |  | 25,593 | ​
​ Supplemental balance sheet information related to leases was as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​
​ | ​ | 2020 |  | 2019 |
​ | ​ | (in thousands) | ​
Finance leases: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Property and equipment finance lease assets, gross | ​ | $ | 5,485 | ​ | $ | 30,610 | ​
Accumulated depreciation | ​ |  | (3,867) | ​ |  | (20,564) | ​
Property and equipment finance lease assets, net | ​ | $ | 1,618 | ​ | $ | 10,046 | ​
Summary of supplemental lease information | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​
​ | ​ | 2020 |  | 2019 | ​
Weighted average remaining lease term | ​ | ​ | ​ | ​ | ​ | ​ | ​
Operating leases | ​ | ​ | 13.4 years | ​ | ​ | 13.1 years | ​
Finance leases | ​ | ​ | 3.9 years | ​ | ​ | 1.6 years | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average discount rate | ​ | ​ | ​ | ​ | ​ | ​ | ​
Operating leases | ​ | ​ | 6.0 % | ​ | ​ | 6.0 % | ​
Finance leases | ​ |  | 8.0 % | ​ | ​ | 6.0 % | ​
Schedule of maturities of operating lease liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Operating leases |  | Finance leases | ​
​ | ​ | (in thousands) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
2021 | ​ | $ | 2,346 | ​ | $ | 912 | ​
2022 | ​ | ​ | 2,245 | ​ | ​ | 912 | ​
2023 | ​ | ​ | 2,061 | ​ | ​ | 139 | ​
2024 | ​ | ​ | 1,841 | ​ | ​ | 139 | ​
2025 | ​ | ​ | 1,527 | ​ | ​ | 139 | ​
Thereafter | ​ | ​ | 11,838 | ​ | ​ | 280 | ​
Total lease payments | ​ | ​ | 21,858 | ​ | ​ | 2,521 | ​
Less imputed interest | ​ | ​ | (6,926) | ​ | ​ | (297) | ​
Total | ​ | $ | 14,932 | ​ | $ | 2,224 | ​
Schedule of maturities of finance lease liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Operating leases |  | Finance leases | ​
​ | ​ | (in thousands) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
2021 | ​ | $ | 2,346 | ​ | $ | 912 | ​
2022 | ​ | ​ | 2,245 | ​ | ​ | 912 | ​
2023 | ​ | ​ | 2,061 | ​ | ​ | 139 | ​
2024 | ​ | ​ | 1,841 | ​ | ​ | 139 | ​
2025 | ​ | ​ | 1,527 | ​ | ​ | 139 | ​
Thereafter | ​ | ​ | 11,838 | ​ | ​ | 280 | ​
Total lease payments | ​ | ​ | 21,858 | ​ | ​ | 2,521 | ​
Less imputed interest | ​ | ​ | (6,926) | ​ | ​ | (297) | ​
Total | ​ | $ | 14,932 | ​ | $ | 2,224 | ​

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- Definition Tabular disclosure of undiscounted cash flows of finance lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to finance 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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- 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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