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Shareholders' Equity (Schedule Of Net Income Per Common Share) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Earnings Per Share [Line Items]      
Net income (loss) to common shareholders $ 1,960,060 $ (252,277) $ 2,387,135
Adjustment of redeemable noncontrolling interests 6,212 (69,896) 46,874
Adjusted net income (loss) to common shareholders $ 1,966,272 $ (322,173) $ 2,434,009
Basic common shares outstanding 13,347,000 13,580,000 13,768,000
Diluted common shares outstanding 13,378,000 13,580,000 13,800,000
Basic net income (loss) per common share $ 147.32 $ (23.72) $ 176.79
Diluted net income per common share $ 146.98 [1],[2] $ (23.72) $ 176.38
Number of shares available for future awards [2] 86,144    
Restricted Stock Units (RSUs) [Member]      
Earnings Per Share [Line Items]      
Dilutive potential common shares from restricted stock units and restricted stock [1],[2] 31,000 0 32,000
Potential incremental common shares attributable to share-based payment arrangements [1]   33,000  
[1] The impact of 33 thousand shares from restricted stock units and restricted stock was excluded from the computation of diluted net loss per common share for the year ended December 31, 2022 because the effect would have been anti-dilutive.
[2]     The Company has issued grants and awards of restricted stock units to employees as performance, retention or hiring incentives, as well as awards of restricted stock to non-employee directors, under its equity incentive compensation plan. At December 31, 2023, there were 86,144 shares available for future awards under the Company's equity incentive compensation plan.