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Derivative Financial Instruments (Details 2) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Derivatives not designated as hedging instruments      
Gain (loss) on derivatives recognized in net income $ (16,608) $ 26,847  
Net investment income      
Derivatives not designated as hedging instruments      
Change in fair value of GLWB 1,670 (10,450)  
Policyholders' Funds      
Derivatives not designated as hedging instruments      
Embedded derivatives - GLWB 4,042   $ 5,712
Interest rate swaps | Net investment income      
Derivatives not designated as hedging instruments      
Gain (loss) on derivatives recognized in net income (1,549) 10,622  
Interest rate futures | Net investment income      
Derivatives not designated as hedging instruments      
Gain (loss) on derivatives recognized in net income (14) (204)  
Interest rate futures | Realized investment gains (losses)      
Derivatives not designated as hedging instruments      
Gain (loss) on derivatives recognized in net income 5 (32)  
Futures on equity indices | Net investment income      
Derivatives not designated as hedging instruments      
Gain (loss) on derivatives recognized in net income (684) (230)  
Futures on equity indices | Realized investment gains (losses)      
Derivatives not designated as hedging instruments      
Gain (loss) on derivatives recognized in net income (1,284) (1,441)  
Interest rate swaptions | Net investment income      
Derivatives not designated as hedging instruments      
Gain (loss) on derivatives recognized in net income (27) 134  
Interest rate swaptions | Realized investment gains (losses)      
Derivatives not designated as hedging instruments      
Gain (loss) on derivatives recognized in net income (74) (195)  
Other forward contracts | Net investment income      
Derivatives not designated as hedging instruments      
Gain (loss) on derivatives recognized in net income 6,784 3,056  
Other forward contracts | Realized investment gains (losses)      
Derivatives not designated as hedging instruments      
Gain (loss) on derivatives recognized in net income (5,597) 2,938  
Cross-currency swaps | Net investment income      
Derivatives not designated as hedging instruments      
Gain (loss) on derivatives recognized in net income (14,168) 12,199  
Cash flow hedges:      
Effect of derivative instruments in the condensed consolidated statement of income      
Gain (loss) recognized in OCI on derivatives (Effective portion) (6,955) (1,604)  
Gain (loss) reclassified from OCI into net income (Effective portion) 1,442 2,486  
Cash flow hedges: | Interest rate swaps | Net investment income      
Effect of derivative instruments in the condensed consolidated statement of income      
Gain (loss) recognized in OCI on derivatives (Effective portion) (148) 525  
Gain (loss) reclassified from OCI into net income (Effective portion) 1,220 1,494  
Cash flow hedges: | Interest rate swaps | Interest Expense      
Effect of derivative instruments in the condensed consolidated statement of income      
Gain (loss) recognized in OCI on derivatives (Effective portion) 3,843 0  
Gain (loss) reclassified from OCI into net income (Effective portion) (880) 0  
Cash flow hedges: | Cross-currency swaps | Net investment income      
Effect of derivative instruments in the condensed consolidated statement of income      
Gain (loss) recognized in OCI on derivatives (Effective portion) (10,650) (2,129)  
Gain (loss) reclassified from OCI into net income (Effective portion) $ 1,102 $ 992