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Debt And Derivative Instruments (Schedule Of Maturities Of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Sep. 13, 2012
Debt Instrument [Line Items]    
2021 $ 78,947  
2022 77,516  
2023 76,086  
2024 75,119  
2025 75,052  
2026 and thereafter 426,211  
Long term debt including interest 808,931  
Less: Amount representing interest (82,013)  
Long-term Debt, Total 726,918  
Term Loan [Member] | Development Bank of Japan [Member]    
Debt Instrument [Line Items]    
2021 2,350  
2022 2,310  
2023 22,140  
Long term debt including interest 26,800  
Less: Amount representing interest (1,300)  
Long-term Debt, Total 25,500  
Term Loan [Member] | Consortium of Banks, Note Dated April 11, 2012 [Member]    
Debt Instrument [Line Items]    
2021 69,145  
Less: Amount representing interest (645)  
Long-term Debt, Total 68,500  
Senior Secured Notes [Member]    
Debt Instrument [Line Items]    
2021 8,322  
2023 42,467  
Long term debt including interest 50,789  
Less: Amount representing interest (4,124)  
Long-term Debt, Total 46,665 $ 103,000
Collateralized Financing Obligations [Member]    
Debt Instrument [Line Items]    
2021 36,358  
2022 16,531  
2026 and thereafter 22,948  
Long term debt including interest 75,837  
Less: Amount representing interest (6,208)  
Long-term Debt, Total 69,629  
Loan Agreement With Bank $100.0 Million [Member]    
Debt Instrument [Line Items]    
2021 9,848  
2022 9,574  
2023 77,266  
Long term debt including interest 96,688  
Less: Amount representing interest (10,188)  
Long-term Debt, Total 86,500  
Loan Agreement With Bank $100.0 Million [Member] | Term Loan [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Total 86,500  
Series 2020-1 Asset-Backed Notes [Member] | Asset Backed Notes [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Total 726,900  
Variable Interest Entity, Primary Beneficiary [Member] | Term Loan, Fixed Rate 4.2% [Member] | Term Loan [Member]    
Debt Instrument [Line Items]    
2021 6,725  
2022 6,725  
2023 6,725  
2024 6,725  
2025 6,725  
2026 and thereafter 1,355  
Long term debt including interest 34,980  
Less: Amount representing interest (3,746)  
Long-term Debt, Total $ 31,234