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Shareholders' Equity (Schedule Of Net Income (Loss) Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Earnings Per Share [Line Items]        
Net income (loss) to common shareholders $ 677,511 $ (933,796) $ 1,166,163 $ (985,537)
Adjustment of redeemable noncontrolling interests (5,758) (7,498) 7,715 (44,438)
Adjusted net income (loss) to common shareholders $ 671,753 $ (941,294) $ 1,173,878 $ (1,029,975)
Basic common shares outstanding 13,382 13,612 13,416 13,632
Diluted common shares outstanding 13,411 13,612 13,441 13,632
Basic net income (loss) per common share $ 50.20 $ (69.15) $ 87.50 $ (75.56)
Earnings Per Share, Diluted $ 50.09 $ (69.15) [1] $ 87.34 $ (75.56) [1]
Restricted Stock Units (RSUs) [Member]        
Earnings Per Share [Line Items]        
Dilutive potential common shares from restricted stock units and restricted stock 29 0 [1] 25 0 [1]
Potential Incremental Common Shares Attributable to Share-based Payment Arrangements   31   29
[1] The impact of 31 thousand and 29 thousand shares from restricted stock units and restricted stock was excluded from the computation of diluted net loss per common share for the quarter and six months ended June 30, 2022, respectively, because the effect would have been anti-dilutive.