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Equity-Accounted Investments And Other Long-Term Assets (Carrying Amount Of Equity-Accounted Investments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Schedule of Equity Method Investments [Line Items]            
As reported, beginning of period $ 285,261 $ 269,542 $ 290,213 [1] $ 318,473 $ 298,041 $ 317,342
Loans 106,738   78,486 [1]      
TOTAL LIABILITIES, REDEEMABLE COMMON STOCK AND SHAREHOLDERS' EQUITY 476,978   453,678 [1]      
Nonconsolidated Investee or Group of Investees [Member]            
Schedule of Equity Method Investments [Line Items]            
As reported, beginning of period 52,126   65,216      
Loans 1,000   620      
TOTAL LIABILITIES, REDEEMABLE COMMON STOCK AND SHAREHOLDERS' EQUITY $ 53,126   $ 65,836      
[1]
Derived from audited financial statements.