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Consolidated Statements of Shareholders' Equity Statement - USD ($)
$ in Thousands
Total
Common Stock [Member]
Retained Earnings [Member]
Shareholders' equity, beginning balance at Dec. 31, 2017   $ 97,523 $ 1,663,864
Proceeds from stock options exercised   0  
Share-based compensation expense   63  
Withholding tax on stock options exercised   0  
Net income $ 17,573   17,573
Dividends paid to shareholders     (69,165)
Shareholders' equity, ending balance at Jun. 30, 2018 1,709,858 97,586 1,612,272
Shareholders' equity, beginning balance at Mar. 31, 2018   97,546 1,586,675
Proceeds from stock options exercised   0  
Share-based compensation expense   40  
Withholding tax on stock options exercised   0  
Net income 60,180   60,180
Dividends paid to shareholders     (34,583)
Shareholders' equity, ending balance at Jun. 30, 2018 1,709,858 97,586 1,612,272
Shareholders' equity, beginning balance at Dec. 31, 2018 1,617,684 98,026 1,519,658
Proceeds from stock options exercised   591  
Share-based compensation expense   52  
Withholding tax on stock options exercised   (22)  
Net income 219,117   219,117
Dividends paid to shareholders     (69,460)
Shareholders' equity, ending balance at Jun. 30, 2019 1,767,962 98,647 1,669,315
Shareholders' equity, beginning balance at Mar. 31, 2019   98,495 1,620,799
Proceeds from stock options exercised   138  
Share-based compensation expense   36  
Withholding tax on stock options exercised   (22)  
Net income 83,250   83,250
Dividends paid to shareholders     (34,734)
Shareholders' equity, ending balance at Jun. 30, 2019 $ 1,767,962 $ 98,647 $ 1,669,315