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Debt And Interest Expense (Components Of Interest Expense) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Short-term Debt [Line Items] |  |  |
Contractual interest on Convertible Debentures | $ 87,063 | $ 87,063 | $ 73,638
Interest Expense, Debt | 0 | 20,015 | 47,432
Amortization of debt discount on the Convertible Debentures | 0 | 4,236 | 12,012
Other interest expense | 3,548 | 3,531 | 3,254
Total interest expense | $ 90,611 | $ 114,845 | $ 136,336

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