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Leases (Tables) | 6 Months Ended
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Jun. 30, 2020
Leases |
Schedule of components of lease expense | ​ The components of lease expense were as follows and are primarily included in cost of sales on the accompanying unaudited condensed consolidated statements of operations, in thousands:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended June 30, | ​ | Six Months Ended June 30,
​ | ​ | 2020 | ​ | 2019 | ​ | 2020 | ​ | 2019
Operating lease cost (a) | ​ | $ | 12,096 | ​ | $ | 12,668 | ​ | $ | 24,367 | ​ | $ | 26,204
Short-term lease cost | ​ | ​ | 2,813 | ​ | ​ | 3,005 | ​ | ​ | 5,877 | ​ | ​ | 6,010
Sublease income | ​ | ​ | (49) | ​ | ​ | (154) | ​ | ​ | (111) | ​ | ​ | (308)
Net lease cost | ​ | $ | 14,860 | ​ | $ | 15,519 | ​ | $ | 30,133 | ​ | $ | 31,906
(a) | Includes variable cost components of $1,330 and $1,389 in the three months ended June 30, 2020 and 2019, respectively, and $2,774 and $2,767 of variable cost components in the six months ended June 30, 2020 and 2019, respectively.
Schedule of future minimum lease payments | ​ Future minimum lease payments under non-cancellable operating leases as of June 30, 2020 were as follows, in thousands:
​ | ​ | ​ | ​
Payments due by Period |  | ​
2020 | ​ | $ | 20,072
2021 | ​ | ​ | 30,979
2022 | ​ | ​ | 20,751
2023 | ​ | ​ | 11,043
2024 | ​ | ​ | 6,287
2025 & Thereafter | ​ | ​ | 6,390
Total future minimum lease payments | ​ | ​ | 95,522
​ | ​ | ​ | ​
Less: imputed interest | ​ | ​ | (6,280)
​ | ​ | ​ | ​
Lease liability at June 30, 2020 | ​ | $ | 89,242
Schedule of cash flow information | The amount below is included in the cash flows provided by (used in) operating activities section on the accompanying unaudited condensed consolidated statements of cash flows, in thousands:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Six Months Ended June 30,
​ | ​ | 2020 | ​ | 2019
Cash paid for amounts included in the measurement of lease liabilities | ​ | $ | (21,544) | ​ | $ | (22,896)

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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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