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Reinsurance (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Ceded Credit Risk [Line Items] |  |  |
Reinsurance recoverable | $ 2,908,343 | $ 1,572,321 | $ 2,372,221
Allowance for reinsurance recoverable |  |  |
Ceded Credit Risk [Line Items] |  |  |
Valuation allowances and reserves balance | $ 8,500 |  | $ 9,000
Customer Concentration Risk, Customer One | Reinsurance recoverable |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk, percentage | 12.00% | 15.50% |
Customer Concentration Risk, Customer One | Allowance for reinsurance recoverable |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk, percentage | 17.60% | 16.20% |
Customer Concentration Risk, Customer Two | Reinsurance recoverable |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk, percentage | 6.90% | 6.70% |
Customer Concentration Risk, Customer Two | Allowance for reinsurance recoverable |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk, percentage | 13.20% | 14.80% |
Customer Concentration Risk, Customer Three | Reinsurance recoverable |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk, percentage | 6.50% | 6.50% |
Customer Concentration Risk, Customer Three | Allowance for reinsurance recoverable |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk, percentage | 12.00% | 12.30% |
Ceded Credit Risk, Secured | Reinsurer Concentration Risk | Reinsurance recoverable |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk, percentage | 65.80% | 60.80% |
Ceded Credit Risk, Unsecured | Reinsurer Concentration Risk | Reinsurance recoverable | Standard & Poor's, A- Rating |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk, percentage | 32.10% | 38.00% |
Ceded Credit Risk, Unsecured | Reinsurer Concentration Risk | Reinsurance recoverable | Standard & Poor's, BBB Rating |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk, percentage | 2.10% | 1.20% |
TMR Group Entities |  |  |
Ceded Credit Risk [Line Items] |  |  |
Reinsurance recoverable | $ 548,700 |  |

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