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Credit Facilities (Tables)	9 Months Ended
Credit Facilities (Tables)	Sep. 30, 2020
Line of Credit Facility [Line Items]
Summary Of Costs Incurred Connection With Credit Facilities	Three Months Ended Nine Months Ended September 30, September 30, (Dollars in thousands) 2020 2019 2020 2019 Credit facility interest and fees incurred $ 105 $ 105 $ 560 $ 315
Wells Fargo Bank Group Credit Facility [Member]
Line of Credit Facility [Line Items]
Summary Of Outstanding Letters Of Credit And/Or Borrowings	(Dollars in thousands) At September 30, 2020 At December 31, 2019 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Wells Fargo Bank Group Credit Facility Tranche One $ 200,000 $ 99,077 12/31/2020 $ 200,000 $ 33,737 12/31/2020 Tranche Two 600,000 586,186 12/31/2020 600,000 2,381 7/29/2020 Tranche Two - 1,649 9/30/2020 Tranche Two - 573,353 12/31/2020 Tranche Two - 12,364 1/4/2021 Total Wells Fargo Bank Group Credit Facility $ 800,000 $ 685,263 $ 800,000 $ 623,484
Citibank Bilateral Agreement [Member]
Line of Credit Facility [Line Items]
Summary Of Outstanding Letters Of Credit And/Or Borrowings	(Dollars in thousands) At September 30, 2020 At December 31, 2019 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Citibank Bilateral Letter of Credit Agreement $ 200,000 $ 3,672 11/24/2020 $ 200,000 $ 4,425 02/29/2020 93,846 12/31/2020 512 09/03/2020 4,425 02/28/2021 3,672 11/24/2020 183 12/16/2021 177 12/16/2020 109 12/20/2021 125 12/20/2020 5,475 12/31/2021 101,404 12/31/2020 777 08/15/2022 559 08/15/2021 37,802 09/30/2024 37,096 12/30/2023 Total Citibank Bilateral Agreement $ 200,000 $ 146,289 $ 200,000 $ 147,970
Lloyds Bank plc Credit Facility [Member]
Line of Credit Facility [Line Items]
Summary Of Outstanding Letters Of Credit And/Or Borrowings	(Dollars in thousands) At September 30, 2020 At December 31, 2019 Bank Commitment In Use Date of Expiry Commitment In Use Date of Expiry Lloyd's Bank plc £ 52,175 £ 52,175 12/31/2023 £ 47,000 £ 47,000 12/31/2023 - - - - Total Lloyd's Bank Credit Facility £ 52,175 £ 52,175 £ 47,000 £ 47,000