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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of changes in equity [abstract]      
Income tax relating to cash flow hedges of other comprehensive income $ 8,715 $ (52,282) $ 49,106