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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement of changes in equity [abstract]      
Income tax relating to cash flow hedges included in other comprehensive income $ (6,752) $ 11,322 $ (8,715)
Income tax relating to changes in revaluation surplus included in other comprehensive income 10,480 $ (139,223)  
Income tax relating to changes in revaluation surplus derived from disposal of assets included in other comprehensive income $ 2,978