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Consolidated Statements Of Changes In Shareholders' Equity - USD ($)
$ in Thousands
Common Shares Outstanding [Member]
Common Shares [Member]
Additional Paid-In Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings [Member]
Treasury Shares At Cost [Member]
Total
Change to beginning balance due to adoption of Accounting Standards Update 2016-01       $ (1,201) $ 1,201   $ (1,201)
Balance, beginning of period, shares at Dec. 31, 2017 40,835,272            
Issued during the period, net, shares 143,362            
Balance, end of period, shares at Mar. 31, 2018 40,978,634            
Balance, beginning of period at Dec. 31, 2017   $ 691 $ 2,165,768 (160,891) 9,685,908 $ (3,322,244)  
Issued during the period, net   1          
Share-based compensation plans     (2,249)        
Net increase (decrease) during the period       (179,882)     (179,882)
Net income (loss)         210,318   210,318
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018)         (53,240)   (53,240)
Purchase of treasury shares            
Balance, end of period at Mar. 31, 2018   692 2,163,519 (341,974) 9,844,187 (3,322,244) $ 8,344,180
Balance, beginning of period, shares at Dec. 31, 2017 40,835,272            
Balance, end of period, shares at Dec. 31, 2018 40,651,148           69,202,000
Balance, beginning of period at Dec. 31, 2017   691 2,165,768 (160,891) 9,685,908 (3,322,244)  
Balance, end of period at Dec. 31, 2018   692 2,188,777 (462,557) 9,574,440 (3,397,548) $ 7,903,804
Issued during the period, net, shares 194,584            
Treasury shares acquired, shares (75,193)            
Balance, end of period, shares at Mar. 31, 2019 40,770,539           69,396,000
Issued during the period, net   2          
Share-based compensation plans     767        
Net increase (decrease) during the period       246,446     $ 246,446
Net income (loss)         348,900   348,900
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018)         (57,137)   (57,137)
Purchase of treasury shares           (16,153)  
Balance, end of period at Mar. 31, 2019   $ 694 $ 2,189,544 $ (216,111) $ 9,866,203 $ (3,413,701) $ 8,426,629