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Reserve for Claims and Claim Expenses (Claims and Claim Expense Reserves by Segment) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017
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Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Case Reserves | $ 1,447,010 | $ 1,392,852 |
Additional Case Reserves | 968,878 | 1,021,445 |
IBNR | 2,496,839 | 2,666,111 |
Net reserve for claims and claim expenses | 4,912,727 | 5,080,408 | $ 2,934,688
Other |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Case Reserves | 4,999 | 6,605 |
Additional Case Reserves | 0 | 0 |
IBNR | 8,269 | 11,921 |
Net reserve for claims and claim expenses | 13,268 | 18,526 |
Property |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Case Reserves | 701,202 | 696,285 |
Additional Case Reserves | 850,498 | 896,522 |
IBNR | 687,209 | 893,583 |
Net reserve for claims and claim expenses | 2,238,909 | 2,486,390 |
Casualty and Specialty |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Case Reserves | 740,809 | 689,962 |
Additional Case Reserves | 118,380 | 124,923 |
IBNR | 1,801,361 | 1,760,607 |
Net reserve for claims and claim expenses | $ 2,660,550 | $ 2,575,492 |

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- Definition Liability for Unpaid Claims and Claims Adjustment Expense, Additional Case Reserves, Amount + References No definition available. + Details
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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + Details
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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. + Details
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- Definition Estimated costs as of the balance sheet date of settling insured claims and costs incurred in the claims settlement process for claims that have not yet been submitted to the insurance company for reimbursement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.W) -URI http://asc.fasb.org/extlink&oid=27015833&loc=d3e570705-122907 + Details
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- Definition Costs of settling insured claims and costs incurred in the claims settlement process for the specified year specifically for claims that have already been submitted to the insurance company for reimbursement. + References No definition available. + Details
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