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Senior Notes (Tables)	9 Months Ended
Senior Notes (Tables)	Sep. 30, 2020
Senior Notes [Abstract]
Schedule Of Outstanding Senior Notes	September 30, 2020 December 31, 2019 Consolidated Balance Consolidated Balance (Dollars in thousands) Date Issued Date Due Principal Amounts Sheet Amount Market Value Sheet Amount Market Value Senior notes 06-05-2014 06-01-2044 400,000 $ 397,164 $ 460,252 $ 397,074 $ 452,848
Schedule Of Interest Expense Incurred In Connection With Senior Notes	Three Months Ended Nine Months Ended September 30, September 30, (Dollars In thousands 2020 2019 2020 2019 Interest expense incurred $ 4,868 $ 4,868 $ 14,604 $ 14,604

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

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