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Credit Facilities (Narrative) (Details) £ in Thousands, $ in Thousands |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 26, 2016 USD ($) | Jun. 22, 2012 USD ($) | Mar. 31, 2019 GBP (£) item | Dec. 31, 2018 GBP (£) | Dec. 31, 2015 | Mar. 31, 2019 USD ($) item | Dec. 31, 2018 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of credit facility, number of facilities | item |  |  | 2 |  |  |  |
Line of credit facility, commitment |  |  | £ 30,000 |  |  | $ 1,000,000 |
Wells Fargo Bank Group Credit Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of credit facility, commitment | $ 800,000 | $ 800,000 |  |  |  | $ 800,000 | $ 800,000
Line of credit facility, term of credit facility | 5 years | 4 years |  |  |  |  |
Line of credit facility, number of tranches | item |  |  | 2 |  |  | 2 |
Line of credit facility, required minimum debt-to-capital ratio |  |  | 0.35 |  |  | 0.35 |
Line of credit facility, required minimum net worth |  |  |  |  |  | $ 5,370,979 |
Percentage amount of consolidated net income required to be reserved to maintain compliance with facility covenants |  |  | 25.00% |  |  |  |
Percentage amount of increase in consolidated net worth from new issuance required to be reserved to maintain compliance with facility covenants |  |  | 25.00% |  |  |  |
Increase in reserves due to new issuance during the period required to maintain compliance with facility covenants |  |  |  |  |  | 6,082,341 |
Wells Fargo Bank Group Credit Facility Tranche One [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of credit facility, commitment |  |  |  |  |  | 200,000 | 200,000
Wells Fargo Bank Group Credit Facility Tranche One [Member] | Federal Funds [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of credit facility, spread on variable rate basis |  |  | 0.50% |  |  |  |
Wells Fargo Bank Group Credit Facility Tranche One [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of credit facility, spread on variable rate basis |  |  | 1.00% |  |  |  |
Wells Fargo Bank Group Credit Facility Tranche Two [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of credit facility, commitment |  |  |  |  |  | 600,000 | 600,000
Line of Credit Facility, Expiration Date |  |  | Dec. 31, 2019 | Dec. 31, 2019 |  |  |
Citibank Bilateral Agreement [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of credit facility, commitment |  |  |  |  |  | $ 200,000 | $ 200,000
Percentage of interest on the principal amount of letters of credit issued |  |  | 0.35% |  |  |  |
Percentage of interest on the principal amount of issued extended tenor letters of credit |  |  | 0.45% |  |  |  |
Maximum term allowed to execute issued letters of credit |  |  | 60 months |  |  |  |
Per annum commitment fee on undrawn credit |  |  | 0.15% |  |  |  |
Lloyds Bank plc Credit Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of credit facility, commitment | £ |  |  | £ 30,000 | £ 30,000 |  |  |
Line of credit facility, term of credit facility |  |  | 4 years |  |  |  |
Line of credit facility, required minimum debt-to-capital ratio |  |  | 0.35 |  |  | 0.35 |
Line of credit facility, required minimum net worth |  |  |  |  |  | $ 5,326,009 |
Consolidated net worth, percentage |  |  |  |  | 70.00% |  |
Percentage amount of consolidated net income required to be reserved to maintain compliance with facility covenants |  |  | 25.00% |  |  |  |
Percentage amount of increase in consolidated net worth from new issuance required to be reserved to maintain compliance with facility covenants |  |  | 25.00% |  |  |  |
Increase in reserves due to new issuance during the period required to maintain compliance with facility covenants |  |  |  |  |  | $ 6,073,089 |
Percentage commitment fee per annum |  |  | 0.10% |  |  |  |
Per annum commitment fee on undrawn credit |  |  | 0.35% |  |  |  |

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