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Shareholders' Equity - Share repurchase program (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Class of Stock [Line Items]      
Treasury stock, value of shares acquired $ 2,871 $ 282,762 $ 0
Treasury stock, shares acquired (shares) 110,598 10,559,850 0
Treasury stock, average cost per share $ 25.96 $ 26.78 $ 0
Common shares held in treasury (shares) 168,997,994 168,282,449 156,938,409
Common shares held in treasury, at cost $ 2,406,047 $ 2,382,167  
Common shares      
Class of Stock [Line Items]      
Remaining share repurchase authorization $ 1,000,000    
Cumulative number of shares acquired since inception of share repurchase program 386,300,000    
Aggregate purchase price of shares acquired since inception of share repurchase program $ 3,970,000