Derivative Instruments (Financial Statement Classification and Impact of Derivatives Used in Qualifying and Non-qualifying Hedge Relationships) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Derivative Instruments Gain Loss [Line Items]      
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net $ (4,519) $ (622) $ 1,607
Net Realized Investments Gain Loss [Member]
     
Derivative Instruments Gain Loss [Line Items]      
DerivativeGainLossOnDerivativeNet (52,799) (186,425) 177,855
Net Investment Income [Member]
     
Derivative Instruments Gain Loss [Line Items]      
DerivativeGainLossOnDerivativeNet 1,029 707 233
Other Income [Member]
     
Derivative Instruments Gain Loss [Line Items]      
DerivativeGainLossOnDerivativeNet (811) 40 49
Accumulated Other Comprehensive Income (loss) [Member]
     
Derivative Instruments Gain Loss [Line Items]      
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net (4,848) [1] (2,376) [1] 1,715 [1]
Cash Flow Hedging [Member] | Net Realized Investments Gain Loss [Member]
     
Derivative Instruments Gain Loss [Line Items]      
DerivativeGainLossOnDerivativeNet 0 0 (337)
Cash Flow Hedging [Member] | Net Investment Income [Member]
     
Derivative Instruments Gain Loss [Line Items]      
DerivativeGainLossOnDerivativeNet 1,029 707 233
Cash Flow Hedging [Member] | Other Income [Member]
     
Derivative Instruments Gain Loss [Line Items]      
DerivativeGainLossOnDerivativeNet (794) 46 49
Cash Flow Hedging [Member] | Accumulated Other Comprehensive Income (loss) [Member]
     
Derivative Instruments Gain Loss [Line Items]      
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net (4,848) [1] (2,376) [1] 1,715 [1]
Cash Flow Hedging [Member] | Cross Currency Interest Rate Contract [Member] | Net Realized Investments Gain Loss [Member]
     
Derivative Instruments Gain Loss [Line Items]      
DerivativeGainLossOnDerivativeNet 0 0 (337)
Cash Flow Hedging [Member] | Cross Currency Interest Rate Contract [Member] | Net Investment Income [Member]
     
Derivative Instruments Gain Loss [Line Items]      
DerivativeGainLossOnDerivativeNet 1,029 707 233
Cash Flow Hedging [Member] | Cross Currency Interest Rate Contract [Member] | Other Income [Member]
     
Derivative Instruments Gain Loss [Line Items]      
DerivativeGainLossOnDerivativeNet (794) 46 49
Cash Flow Hedging [Member] | Cross Currency Interest Rate Contract [Member] | Accumulated Other Comprehensive Income (loss) [Member]
     
Derivative Instruments Gain Loss [Line Items]      
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net (4,848) [1] (2,376) [1] 1,715 [1]
Nondesignated [Member] | Net Realized Investments Gain Loss [Member]
     
Derivative Instruments Gain Loss [Line Items]      
DerivativeGainLossOnDerivativeNet (52,799) (186,425) 178,192
Nondesignated [Member] | Net Investment Income [Member]
     
Derivative Instruments Gain Loss [Line Items]      
DerivativeGainLossOnDerivativeNet 0 0 0
Nondesignated [Member] | Other Income [Member]
     
Derivative Instruments Gain Loss [Line Items]      
DerivativeGainLossOnDerivativeNet (17) (6) 0
Nondesignated [Member] | Accumulated Other Comprehensive Income (loss) [Member]
     
Derivative Instruments Gain Loss [Line Items]      
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net 0 [1] 0 [1] 0 [1]
Nondesignated [Member] | Interest Rate Contract [Member] | Net Realized Investments Gain Loss [Member]
     
Derivative Instruments Gain Loss [Line Items]      
DerivativeGainLossOnDerivativeNet (191,954) 1,309 90,706
Nondesignated [Member] | Interest Rate Contract [Member] | Net Investment Income [Member]
     
Derivative Instruments Gain Loss [Line Items]      
DerivativeGainLossOnDerivativeNet 0 0 0
Nondesignated [Member] | Interest Rate Contract [Member] | Other Income [Member]
     
Derivative Instruments Gain Loss [Line Items]      
DerivativeGainLossOnDerivativeNet 0 0 0
Nondesignated [Member] | Interest Rate Contract [Member] | Accumulated Other Comprehensive Income (loss) [Member]
     
Derivative Instruments Gain Loss [Line Items]      
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net 0 [1] 0 [1] 0 [1]
Nondesignated [Member] | Foreign Exchange Contract [Member] | Net Realized Investments Gain Loss [Member]
     
Derivative Instruments Gain Loss [Line Items]      
DerivativeGainLossOnDerivativeNet 51 (147) 175
Nondesignated [Member] | Foreign Exchange Contract [Member] | Net Investment Income [Member]
     
Derivative Instruments Gain Loss [Line Items]      
DerivativeGainLossOnDerivativeNet 0 0 0
Nondesignated [Member] | Foreign Exchange Contract [Member] | Other Income [Member]
     
Derivative Instruments Gain Loss [Line Items]      
DerivativeGainLossOnDerivativeNet 0 0 0
Nondesignated [Member] | Foreign Exchange Contract [Member] | Accumulated Other Comprehensive Income (loss) [Member]
     
Derivative Instruments Gain Loss [Line Items]      
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net 0 [1] 0 [1] 0 [1]
Nondesignated [Member] | Cross Currency Interest Rate Contract [Member] | Net Realized Investments Gain Loss [Member]
     
Derivative Instruments Gain Loss [Line Items]      
DerivativeGainLossOnDerivativeNet (3,450) (866) 1,102
Nondesignated [Member] | Cross Currency Interest Rate Contract [Member] | Net Investment Income [Member]
     
Derivative Instruments Gain Loss [Line Items]      
DerivativeGainLossOnDerivativeNet 0 0 0
Nondesignated [Member] | Cross Currency Interest Rate Contract [Member] | Other Income [Member]
     
Derivative Instruments Gain Loss [Line Items]      
DerivativeGainLossOnDerivativeNet (17) (6) 0
Nondesignated [Member] | Cross Currency Interest Rate Contract [Member] | Accumulated Other Comprehensive Income (loss) [Member]
     
Derivative Instruments Gain Loss [Line Items]      
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net 0 [1] 0 [1] 0 [1]
Nondesignated [Member] | Credit Risk Contract [Member] | Net Realized Investments Gain Loss [Member]
     
Derivative Instruments Gain Loss [Line Items]      
DerivativeGainLossOnDerivativeNet (1,106) (763) 733
Nondesignated [Member] | Credit Risk Contract [Member] | Net Investment Income [Member]
     
Derivative Instruments Gain Loss [Line Items]      
DerivativeGainLossOnDerivativeNet 0 0 0
Nondesignated [Member] | Credit Risk Contract [Member] | Other Income [Member]
     
Derivative Instruments Gain Loss [Line Items]      
DerivativeGainLossOnDerivativeNet 0 0 0
Nondesignated [Member] | Credit Risk Contract [Member] | Accumulated Other Comprehensive Income (loss) [Member]
     
Derivative Instruments Gain Loss [Line Items]      
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net 0 [1] 0 [1] 0 [1]
Nondesignated [Member] | Equity Contract [Member] | Net Realized Investments Gain Loss [Member]
     
Derivative Instruments Gain Loss [Line Items]      
DerivativeGainLossOnDerivativeNet (130,714) (69,527) (3,264)
Nondesignated [Member] | Equity Contract [Member] | Net Investment Income [Member]
     
Derivative Instruments Gain Loss [Line Items]      
DerivativeGainLossOnDerivativeNet 0 0 0
Nondesignated [Member] | Equity Contract [Member] | Other Income [Member]
     
Derivative Instruments Gain Loss [Line Items]      
DerivativeGainLossOnDerivativeNet 0 0 0
Nondesignated [Member] | Equity Contract [Member] | Accumulated Other Comprehensive Income (loss) [Member]
     
Derivative Instruments Gain Loss [Line Items]      
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net 0 [1] 0 [1] 0 [1]
Nondesignated [Member] | Embedded Derivative [Member] | Net Realized Investments Gain Loss [Member]
     
Derivative Instruments Gain Loss [Line Items]      
DerivativeGainLossOnDerivativeNet 274,374 (116,431) 88,740
Nondesignated [Member] | Embedded Derivative [Member] | Net Investment Income [Member]
     
Derivative Instruments Gain Loss [Line Items]      
DerivativeGainLossOnDerivativeNet 0 0 0
Nondesignated [Member] | Embedded Derivative [Member] | Other Income [Member]
     
Derivative Instruments Gain Loss [Line Items]      
DerivativeGainLossOnDerivativeNet 0 0 0
Nondesignated [Member] | Embedded Derivative [Member] | Accumulated Other Comprehensive Income (loss) [Member]
     
Derivative Instruments Gain Loss [Line Items]      
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net $ 0 [1] $ 0 [1] $ 0 [1]
[1] Amounts deferred in “Accumulated other comprehensive income (loss).”