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Credit Facilities (Summary Of Outstanding Letters Of Credit And/Or Borrowings) (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2019 GBP (£)	Dec. 31, 2018 GBP (£)	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)	May 26, 2016 USD ($)	Jun. 22, 2012 USD ($)
Line of Credit Facility [Line Items]
Commitment	£ 30,000,000		$ 1,000,000,000
Wells Fargo Bank Group Credit Facility Tranche One [Member]
Line of Credit Facility [Line Items]
Commitment			200,000,000	$ 200,000,000
In Use			0	0
Wells Fargo Bank Group Credit Facility Tranche Two [Member]
Line of Credit Facility [Line Items]
Commitment			600,000,000	600,000,000
In Use			597,058,000	558,818,000
Wells Fargo Bank Group Credit Facility [Member]
Line of Credit Facility [Line Items]
Commitment			800,000,000	800,000,000	$ 800,000,000	$ 800,000,000
In Use			597,058,000	558,818,000
Date of Expiry	Dec. 31, 2019	Dec. 31, 2019
Citibank Bilateral Letter Of Credit Agreement One [Member]
Line of Credit Facility [Line Items]
Commitment			200,000,000	200,000,000
In Use			3,672,000	3,482,000
Date of Expiry	Nov. 24, 2019	Feb. 28, 2019
Citibank Bilateral Letter Of Credit Agreement Two [Member]
Line of Credit Facility [Line Items]
In Use			72,488,000	3,672,000
Date of Expiry	Dec. 31, 2019	Nov. 24, 2019
Citibank Bilateral Letter Of Credit Agreement Three [Member]
Line of Credit Facility [Line Items]
In Use			3,482,000	72,443,000
Date of Expiry	Feb. 29, 2020	Dec. 31, 2019
Citibank Bilateral Letter Of Credit Agreement Four [Member]
Line of Credit Facility [Line Items]
In Use			289,000	296,000
Date of Expiry	Aug. 15, 2020	Aug. 15, 2020
Citibank Bilateral Letter Of Credit Agreement Five [Member]
Line of Credit Facility [Line Items]
In Use			173,000	177,000
Date of Expiry	Dec. 16, 2020	Dec. 16, 2020
Citibank Bilateral Letter Of Credit Agreement Six [Member]
Line of Credit Facility [Line Items]
In Use			122,000	125,000
Date of Expiry	Dec. 20, 2020	Dec. 20, 2020
Citibank Bilateral Letter Of Credit Agreement Seven [Member]
Line of Credit Facility [Line Items]
In Use			2,989,000	1,851,000
Date of Expiry	Dec. 31, 2020	Nov. 04, 2022
Citibank Bilateral Letter Of Credit Agreement Eight [Member]
Line of Credit Facility [Line Items]
In Use			40,876,000	407,000
Date of Expiry	Jun. 30, 2023	Nov. 13, 2022
Citibank Bilateral Letter Of Credit Agreement Nine [Member]
Line of Credit Facility [Line Items]
In Use			0	59,293,000
Date of Expiry		Dec. 30, 2022
Citibank Bilateral Agreement [Member]
Line of Credit Facility [Line Items]
Commitment			200,000,000	200,000,000
In Use			$ 124,091,000	$ 141,746,000
Lloyds Bank PLC [Member]
Line of Credit Facility [Line Items]
Commitment | £	£ 30,000,000	£ 30,000,000
In Use | £	£ 24,845,000	£ 26,000,000
Date of Expiry	Dec. 31, 2022	Dec. 31, 2022
Lloyd's Bank Issuance One [Member]
Line of Credit Facility [Line Items]
Commitment | £	£ 0	£ 0
In Use | £	0	0
Lloyds Bank plc Credit Facility [Member]
Line of Credit Facility [Line Items]
Commitment | £	30,000,000	30,000,000
In Use | £	£ 24,845,000	£ 26,000,000

X

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

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X

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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