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Leases | 12 Months Ended
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Dec. 31, 2020
Leases [Abstract] |
Leases | 18.LEASES We have operating leases for facilities used for manufacturing, research and development, sales and distribution, and office space, as well as leases for manufacturing and office equipment, vehicles, and land. Our leases have remaining terms of less than one year to approximately 29 years. A number of our lease agreements contain options to renew at our discretion for periods of up to 15 years and options to terminate the leases within one year. The lease term used to calculate ROU assets and lease liabilities includes renewal and termination options that are deemed reasonably certain to be exercised. Lease agreements with lease and non-lease components are generally accounted for as a single lease component. We do not have any bargain purchase options in our leases. For leases with an initial term of one year or less, we do not record a ROU asset or lease liability on our consolidated balance sheet. Substantially all of the ROU assets and lease liabilities as of December 31, 2020 recorded on our consolidated balance sheet are related to our cardiovascular segment. From time to time we enter into agreements to sublease a portion of our facilities to third-parties. Such sublease income is not material. We also lease certain hardware consoles to customers and record rental revenue as a component of net sales. Rental revenue under such console leasing arrangements for the years ended December 31, 2020 and 2019 was not significant. The following was included in our consolidated balance sheet as of December 31, 2020 and 2019 (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019
Assets |  | ​ |  |  | ​ |
ROU operating lease assets | ​ | $ | 78,240 | ​ | $ | 80,244
​ | ​ | ​ | ​ | ​ | ​ | ​
Liabilities | ​ |  |  | ​ |  |
Short-term operating lease liabilities | ​ | $ | 12,903 | ​ | $ | 11,550
Long-term operating lease liabilities | ​ |  | 70,941 | ​ |  | 72,714
Total operating lease liabilities | ​ | $ | 83,844 | ​ | $ | 84,264
​ During the year ended December 31, 2015, we entered into sale and leaseback transactions to finance certain production equipment for approximately $2.0 million. At that time, we deferred the gain from the sale and leaseback transaction, of which approximately $93,000 remained as of December 31, 2018. As part of the adoption of ASC 842, we wrote-off the deferred gain as an adjustment to equity through retained earnings as of January 1, 2019. We recognize lease expense for operating leases on a straight-line basis over the term of the lease. Net lease cost for the years ended December 31, 2020, 2019 and 2018 was approximately $16.7 million, $16.5 million, and $14.5 million, respectively. The components of lease costs for the years ended December 31, 2020 and 2019 were as follows, in thousands:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  |  |  | ​ |  | ​
Lease Cost | ​ | Classification | ​ | 2020 | ​ | 2019
Operating lease cost (a) |  | Selling, general and administrative expenses | ​ | $ | 16,735 | ​ | $ | 16,828
Sublease (income) (b) |  | Selling, general and administrative expenses | ​ |  | (15) | ​ |  | (361)
Net lease cost |  |  | ​ | $ | 16,720 | ​ | $ | 16,467
(a) | Includes expense related to short-term leases and variable payments, which were not significant.
(b) | Does not include rental revenue from leases of hardware consoles to customers, which was not significant.
​ Supplemental cash flow information for the years ended December 31, 2020 and 2019 was as follows, in thousands:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Year Ended | ​ | Year Ended
​ | ​ | 2020 | ​ | 2019
Cash paid for amounts included in the measurement of lease liabilities | ​ | $ | 15,059 | ​ | ​ | 14,646
Right-of-use assets obtained in exchange for lease obligations | ​ | $ | 10,938 | ​ | ​ | 10,637
​ Generally, our lease agreements do not specify an implicit rate. Therefore, we estimate our incremental borrowing rate, which is defined as the interest rate we would pay to borrow on a collateralized basis, considering such factors as length of lease term and the risks of the economic environment in which the leased asset operates. As of December 31, 2020 and 2019, the following disclosures for remaining lease term and discount rates were applicable:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | 2020 | ​ | ​ | 2019
Weighted average remaining lease term |  | ​ | 11.5 years | ​ | ​ | 12.3 years
Weighted average discount rate |  | ​ | 3.3% | ​ | ​ | 3.2%
​ As of December 31, 2020, maturities of operating lease liabilities were as follows, in thousands:
​ | ​ | ​ | ​
Year ended December 31, |  | Amounts due under operating leases
2021 | ​ | $ | 14,947
2022 | ​ |  | 12,198
2023 | ​ |  | 9,295
2024 | ​ |  | 8,669
2025 | ​ |  | 7,123
Thereafter | ​ |  | 49,908
Total lease payments | ​ |  | 102,140
Less: Imputed interest | ​ |  | (18,296)
Total | ​ | $ | 83,844
​ As of December 31, 2020, we had additional operating leases for office space that had not yet commenced. These leases will commence during 2021 and are not deemed material.

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- Definition The entire disclosure for operating leases of lessee. Includes, but is not limited to, description of operating lease and maturity analysis of operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=77888251 + Details
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