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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net investment gains (losses) $ (437,596) [1] $ (5,303) [2] $ 65,147 [3]
Other Comprehensive Income (Loss), Net of Tax (299,446) 1,125,440 $ 342,111
Equity securities 5,720,945 0  
Equity securities, available-for-sale 0 5,967,847  
Fair value, level 1 to level 2 transfers, amount 0 0  
Fair value, level 2 to level 1 transfers, amount 0 0  
Net realized investment gains (losses) [4] $ 108,646 51,970  
Short-Term Investments [Member] | Maximum [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment maturity period 1 year    
Nonrecurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets measured at fair value $ 0 0  
Liabilities measured at fair value 0 0  
CATCo Reinsurance Opportunities Fund Ltd. (CROF) [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net investment gains (losses) (16,000)    
Other Comprehensive Income (Loss), Net of Tax   (5,800)  
Equity securities $ 4,500    
Equity securities, available-for-sale   $ 20,500  
[1] Effective January 1, 2018, the Company adopted ASU No. 2016-01. As a result, the change in fair value of equity securities is no longer recognized in other comprehensive income; rather, all changes in the fair value of equity securities are now recognized in net investment losses within net income. Prior periods have not been restated to conform to the current presentation. See note 1.
[2] Effective January 1, 2018, the Company adopted ASU No. 2016-01. As a result, the change in fair value of equity securities is no longer recognized in other comprehensive income; rather, all changes in the fair value of equity securities are now recognized in net investment losses within net income. Prior periods have not been restated to conform to the current presentation. See note 1.
[3] Effective January 1, 2018, the Company adopted ASU No. 2016-01. As a result, the change in fair value of equity securities is no longer recognized in other comprehensive income; rather, all changes in the fair value of equity securities are now recognized in net investment gains within net income. Prior periods have not been restated to conform to the current presentation. See note 1.
[4] Included in change in fair value of equity securities in the consolidated statements of income (loss) and comprehensive income (loss) for the years ended December 31, 2018 and 2017.