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Leases (Tables) | 12 Months Ended
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Dec. 31, 2019
Leases |
Schedule of lease balance sheet information | ​
​ | ​ | ​ | ​ | ​ | ​
Leases |  | ​ |  | December 31,
(in thousands) | ​ | Classification | ​ | 2019
Assets | ​ |  | ​ | ​ |
Operating | ​ | Operating lease right-of-use asset | ​ | $ | 15,704
Finance | ​ | Finance lease right-of-use asset | ​ | ​ | 54,048
Total lease assets | ​ | ​ | ​ | $ | 69,752
Liabilities | ​ |  | ​ | ​ |
Current | ​ | ​ | ​ | ​ | ​
Operating | ​ | Accrued liabilities | ​ | $ | 2,401
Noncurrent | ​ | ​ | ​ | ​ | ​
Operating | ​ | Operating lease liability | ​ | ​ | 14,195
Finance | ​ | Finance lease liability | ​ | ​ | 58,435
Total lease liabilities | ​ |  | ​ | $ | 75,031
Schedule of component of lease expense | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | Year Ended | ​
Lease Cost | ​ | ​ | December 31, | ​
(in thousands) | ​ | Classification | 2019 | ​
Fixed operating lease cost | ​ | Selling, general and administrative expenses | $ | 2,473 | (a)
​ | ​ | ​ | ​ | ​ | ​
Finance lease cost | ​ | Amortization of right-of-use asset included in Selling, general and administrative expenses | $ | 1,822 | ​
Finance lease cost | ​ | Interest on lease liability | $ | 2,565 | ​
(a)Includes short-term leases, which are immaterial. ​
Schedule of maturity of lease liability | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
Maturity of Lease Liabilities | ​ | Operating | ​ | Finance
(in thousands) |  | Leases (a) |  | Leases (b)
2020 | ​ | $ | 3,245 | ​ | $ | —
2021 | ​ | ​ | 3,166 | ​ | ​ | —
2022 | ​ | ​ | 3,119 | ​ | ​ | —
2023 | ​ | ​ | 2,230 | ​ | ​ | 3,543
2024 | ​ | ​ | 2,023 | ​ | ​ | 5,184
Thereafter | ​ | ​ | 6,294 | ​ | ​ | 118,362
Total lease payments | ​ | $ | 20,077 | ​ | $ | 127,089
Less: imputed interest | ​ | ​ | 3,481 | ​ | ​ | 68,654
Total lease liabilities | ​ | $ | 16,596 | ​ | $ | 58,435
(a) | Operating lease payments include $12.0 million related to options to extend lease terms that are reasonably certain of being exercised.
(b) | Finance lease payments include $75.8 million related to options to extend lease terms that are reasonably certain of being exercised.
​
Schedule of operating and finance lease weighted average lease term and discount rate | ​
​ | ​ | ​ | ​
​ | ​ | December 31, | ​
Lease Term and Discount Rate |  | 2019 | ​
Weighted-average remaining lease term (years) | ​ |  | ​
Operating leases | ​ | 6.5 | ​
Finance leases | ​ | 22.3 | ​
Weighted-average discount rate | ​ |  | ​
Operating leases | ​ | 5.5 | %
Finance leases | ​ | 6.0 | %
Schedule of operating and finance lease supplemental cash flow information | ​
​ | ​ | ​
​ | Year Ended
Other Information | December 31,
(in thousands) | 2019
Cash paid for amounts included in the measurement of lease liabilities: | ​ | ​
Operating cash flows from operating leases | $ | 2,134
Right-of-use asset obtained in exchange for lease obligations: | ​ | ​
Operating lease | $ | 17,474
Finance lease | ​ | 55,870

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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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