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Fair Value (Activity Under Level 3, Fair Value Measurements Using Significant Unobservable Inputs By Asset Type) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Transfers in and/or (out) of Level 3 $ 2,942 $ (788)
Market Value [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance fixed maturities 217,138 67,735
Total gains or (losses) (realized/unrealized) Included in earnings (752) 2,011
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss) 1,091 (946)
Purchases, issuances and settlements 215,540 149,126
Transfers in and/or (out) of Level 3 2,942 (788)
Ending balance 435,959 217,138
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date
Market Value [Member] | Corporate Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance fixed maturities 210,186 65,197
Total gains or (losses) (realized/unrealized) Included in earnings (92) 1,655
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss) 1,091 (992)
Purchases, issuances and settlements 215,838 144,326
Transfers in and/or (out) of Level 3 1,192  
Ending balance 428,215 210,186
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date
Market Value [Member] | Foreign Corporate Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance fixed maturities 6,952 2,538
Total gains or (losses) (realized/unrealized) Included in earnings (660) 356
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)   46
Purchases, issuances and settlements (298) 4,800
Transfers in and/or (out) of Level 3 1,750 (788)
Ending balance 7,744 6,952
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date
Fair Value [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance fixed maturities
Total gains or (losses) (realized/unrealized) Included in earnings (293)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)
Purchases, issuances and settlements 2,630
Transfers in and/or (out) of Level 3
Ending balance 2,337
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date
Fair Value [Member] | Foreign Corporate Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance fixed maturities
Total gains or (losses) (realized/unrealized) Included in earnings (293)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)
Purchases, issuances and settlements 2,630
Transfers in and/or (out) of Level 3
Ending balance 2,337
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date