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Leases (Tables) | 3 Months Ended
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Mar. 31, 2020
Leases |
Summary of components of lease expense | The components of lease expense are as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31, | ​
​ |  | 2020 |  | 2019 | ​
Operating lease expense | ​ | $ | 22,978 | (1) | $ | 16,513 | (1)
________________________________________
(1) | Includes short-term leases which are immaterial.
Summary of operating lease liabilities | Our operating lease liabilities are reported on the Condensed Consolidated Balance Sheets as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31, | ​
​ |  | 2020 |  | 2019 | ​
Accrued liabilities | ​ | $ | 79,532 | ​ | $ | 74,036 | ​
Noncurrent operating lease liabilities, net of current portion | ​ |  | 176,546 | ​ |  | 171,225 | ​
​ | ​ | $ | 256,078 | ​ | $ | 245,261 | ​

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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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- References No definition available. + Details
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