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Condensed Consolidated Statements of Shareholders' Equity - USD ($)
$ in Thousands
Total
Preferred Stock
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Treasury Stock
Increase (Decrease) in Stockholders' Equity              
Adoption of accounting standard | ASU 2016-02 [1] $ (497)         $ (497)  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance 5,414,680 $ 0 $ 121,218 $ 524,414 $ 319,475 5,212,971 $ (763,398)
Beginning balance at Dec. 31, 2018 5,415,177 0 121,218 524,414 319,475 5,213,468 (763,398)
Increase (Decrease) in Stockholders' Equity              
Comprehensive income (loss) 735,937       550,592 185,345  
Common dividends declared (18,943)         (18,943)  
Acquisition of treasury stock (110,896)           (110,896)
Stock-based compensation 10,559     (5,885)   (6,817) 23,261
Exercise of stock options 12,089         (7,736) 19,825
Ending balance at Mar. 31, 2019 6,043,426 0 121,218 518,529 870,067 5,364,820 (831,208)
Increase (Decrease) in Stockholders' Equity              
Adoption of accounting standard | ASU 2016-13 [2] (454)         (454)  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance 7,293,853 0 117,218 531,554 1,844,830 5,550,875 (750,624)
Beginning balance at Dec. 31, 2019 7,294,307 0 117,218 531,554 1,844,830 5,551,329 (750,624)
Increase (Decrease) in Stockholders' Equity              
Comprehensive income (loss) (613,043)       (778,583) 165,540  
Common dividends declared (19,963)         (19,963)  
Acquisition of treasury stock (166,729)           (166,729)
Stock-based compensation 9,356     (12,126)   (482) 21,964
Exercise of stock options 16,808         (9,539) 26,347
Ending balance at Mar. 31, 2020 $ 6,520,282 $ 0 $ 117,218 $ 519,428 $ 1,066,247 $ 5,686,431 $ (869,042)
[1] Adoption of ASU 2016-02, Leases (Topic 842), on January 1, 2019.
[2] Adoption of Accounting Standard Update (ASU) 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, on January 1, 2020. See more information in Note 2, New Accounting Standards.