v2.4.0.8
Fair Value of Financial Instruments (Assets Measured on Recurring Basis Utilizing Level 3 Inputs) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Jun. 30, 2013
Mar. 31, 2013
Jun. 30, 2014
Jun. 30, 2013
Fair Value Disclosures [Abstract]            
fair value,measurement with unobservable inputs reconciliation,changes in unrealized gains included in earnings related to assets still held at period end         $ 86 $ 2,722
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]            
Balance at beginning of period 4,276,902 3,888,542 3,751,090 3,504,623 3,888,542 3,504,623
Net realized gains/(losses) 602 (880) (1,574) (3)    
Net unrealized gains/(losses) (235) (149) (1,487) (4,209)    
Purchases 55,452 41,308 27,575 152,549    
Sales (126,868) (68,691) (44,435) (45,589)    
Issuances 761 531 (8) 0    
Settlements 0 0 (1,195) (8)    
Transfers into/(out of) Level 3, net 90,622 370,433 2,810 5,177    
Attributable to policyowner 82,858 43,750 (8,673) 130,110    
Balance at end of period 4,380,094 4,276,902 3,724,103 3,751,090 4,380,094 3,724,103
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3         461,053  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3           $ 7,983