Credit Facilities (Tables)

6 Months Ended

Jun. 30, 2020

Line of Credit Facility [Line Items]

Summary Of Costs Incurred Connection With Credit Facilities

	Three Months Ended				Six Months Ended
	June 30,				June 30,
(Dollars in thousands)	2020		2019		2020		2019
Credit facility interest and fees incurred	$	332	$	105	$	455	$	210

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 June 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		579,543	12/31/2020		600,000		2,381	7/29/2020
	Tranche Two				5,324	7/29/2021				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	$	683,944		$	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 June 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
				93,582	12/31/2020				512	09/03/2020
				4,425	02/28/2021				3,672	11/24/2020
				546	08/15/2021				177	12/16/2020
				173	12/16/2021				125	12/20/2020
				122	12/20/2021				101,404	12/31/2020
				5,161	12/31/2021				559	08/15/2021
				149	04/13/2024				37,096	12/30/2023
				37,121	6/30/2024				-
Total Citibank Bilateral Agreement	$	200,000	$	144,951		$	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 June 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