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Other long-term liabilities - Other long-term liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Subclassifications of assets, liabilities and equities [abstract] |  |
Cash flow hedges | $ 180,798 | $ 195,124
Share-based compensation liability | 71,913 | 18,382
Defined benefit pension plans | 36,646 | 28,121
Site restoration costs | 31,941 | 31,092
Land mortgage | 29,430 | 29,849
Government grant construction obligation | 0 | 3,173
Other | 3,915 | 6,582
Other long-term liabilities, total | 354,643 | 312,323
Less current maturities | (27,152) | (26,252)
Other non-current liabilities | $ 327,491 | $ 286,071

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