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Schedule of Rollforward of Level Three Assets and Liabilities Held at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Level 3 assets, Balance at beginning of period $ 2,919 $ 9,648 $ 2,247
Level 3 assets, Total gains (losses) included in net income   (4) [1] (18) [2]
Level 3 assets, Total gains (losses) included in OCI   42 889
Level 3 assets, Purchases, sales, issues and settlements, net     17,199
Level 3 assets, Transfers into Level 3         
Level 3 assets, Transfers out of Level 3 (2,321) (15,643) (10,669)
Level 3 liabilities, Balance at beginning of period (506,678) (494,149) (15,526)
Level 3 liabilities, Total gains (losses) included in net income 131,054 [3] (110,951) [1] (4,877) [2]
Level 3 liabilities, Total gains (losses) included in OCI         
Level 3 liabilities, Purchases, sales, issues and settlements, net       
Level 3 liabilities, Transfers into Level 3     (473,746)
Level 3 liabilities, Transfers out of Level 3         
Level 3 assets, Purchases   10,000  
Level 3 assets, Sales        
Level 3 assets, Issues        
Level 3 assets, Settlements (286) (1,124)  
Level 3 assets, Balance at end of period 312 2,919 9,648
Level 3 liabilities, Purchases        
Level 3 liabilities, Sales        
Level 3 liabilities, Issues (11,024) (55,559)  
Level 3 liabilities, Settlements 71,722 153,981  
Level 3 liabilities, Balance at end of period (314,926) (506,678) (494,149)
Corporate
     
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Level 3 assets, Balance at beginning of period 598 852 1,089
Level 3 assets, Total gains (losses) included in net income     (1) [2]
Level 3 assets, Total gains (losses) included in OCI   199  
Level 3 assets, Purchases, sales, issues and settlements, net     7,740
Level 3 assets, Transfers into Level 3         
Level 3 assets, Transfers out of Level 3   (10,199) (7,976)
Level 3 assets, Purchases   10,000  
Level 3 assets, Sales        
Level 3 assets, Issues        
Level 3 assets, Settlements (286) (254)  
Level 3 assets, Balance at end of period 312 598 852
Residential mortgage-backed securities ("RMBS")
     
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Level 3 assets, Balance at beginning of period 2,321 6,880  
Level 3 assets, Total gains (losses) included in net income   (4) [1] (17) [2]
Level 3 assets, Total gains (losses) included in OCI   (108) 131
Level 3 assets, Purchases, sales, issues and settlements, net     9,459
Level 3 assets, Transfers into Level 3         
Level 3 assets, Transfers out of Level 3 (2,321) (3,577) (2,693)
Level 3 assets, Sales        
Level 3 assets, Issues        
Level 3 assets, Settlements   (870)  
Level 3 assets, Balance at end of period   2,321 6,880
Commercial mortgage-backed securities ("CMBS")
     
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Level 3 assets, Balance at beginning of period   1,916 1,158
Level 3 assets, Total gains (losses) included in OCI   (49) 758
Level 3 assets, Transfers into Level 3        
Level 3 assets, Transfers out of Level 3   (1,867)  
Level 3 assets, Sales       
Level 3 assets, Issues       
Level 3 assets, Balance at end of period     1,916
Derivatives embedded in life and annuity contracts
     
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Level 3 liabilities, Balance at beginning of period (506,678) (494,149) (15,526)
Level 3 liabilities, Total gains (losses) included in net income 131,054 [3] (110,951) [1] (4,877) [2]
Level 3 liabilities, Total gains (losses) included in OCI         
Level 3 liabilities, Purchases, sales, issues and settlements, net       
Level 3 liabilities, Transfers into Level 3     (473,746)
Level 3 liabilities, Transfers out of Level 3         
Level 3 liabilities, Purchases        
Level 3 liabilities, Sales        
Level 3 liabilities, Issues (11,024) (55,559)  
Level 3 liabilities, Settlements 71,722 153,981  
Level 3 liabilities, Balance at end of period $ (314,926) $ (506,678) $ (494,149)
[1] The amount attributable to fixed income securities is reported in the Statements of Operations and Comprehensive Income as net investment income. The amount attributable to derivatives embedded in life and annuity contracts is reported as follows: $(106.6) million in interest credited to contractholder funds and $(4.3) million in contract benefits. These amounts are ceded in accordance with the Company's reinsurance agreements.
[2] The amount attributable to fixed income securities is reported in the Statements of Operations and Comprehensive Income as net investment income. The amount attributable to derivatives embedded in life and annuity contracts is reported as a component of contract benefits and is ceded in accordance with the Company's reinsurance agreements.
[3] The amount attributable to derivatives embedded in life and annuity contracts is reported as follows: $125.9 million in interest credited to contractholder funds and $5.1 million in contract benefits. These amounts are ceded in accordance with the Company's reinsurance agreements.