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Reserve for Claims and Claim Expenses (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Mar. 02, 2015
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Net reserve for claims and claim expenses | $ 3,704,050 | $ 3,493,778 | $ 2,568,730 | $ 2,632,519 |
Claims and claim expenses recovered | (1,458,518) | (1,558,960) | (179,820) |  |
Reinsurance balances payable |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Aggregate deposit liabilities | 10,300 | 21,700 |  |  |
Aggregate deposit assets |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Aggregate deposit assets | 0 | 0 |  |  |
Deposit Contracts, Underwriting Risk Only |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Claims and claim expenses recovered | 200 | 200 | 200 |  |
Deposit Contracts, Timing Risk Only |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Increase in other income related to assumed reinsurance contracts | 11,200 | $ 3,700 | $ 6,200 |  |
Property |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Net reserve for claims and claim expenses | 1,373,125 |  |  |  |
Casualty and Specialty |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Net reserve for claims and claim expenses | $ 2,330,557 |  |  |  |
Platinum Underwriters Holdings, Ltd. |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Net reserve for claims and claim expenses |  |  |  |  | $ 1,400,000
Platinum Underwriters Holdings, Ltd. | Property |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Net reserve for claims and claim expenses |  |  |  |  | 179,700
Platinum Underwriters Holdings, Ltd. | Casualty and Specialty |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Net reserve for claims and claim expenses |  |  |  |  | $ 1,200,000

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- Definition Carrying amount of assets as of the balance sheet date pertaining to amounts paid by the insured (including a ceding company) under insurance or reinsurance contracts for which insurance risk is not transferred. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99397363&loc=d3e9420-108338 + Details
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