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Fair Values Level 3 Financial Instruments Changes in Fair Value (Details) (Fair Value, Inputs, Level 3 [Member], Fair Value, Measurements, Recurring [Member], USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Asset Balance, beginning of period $ 294,829 $ 207,646
Purchases 16,709 51,092
Disposals (15,551) (6,423)
Realized and unrealized gains (losses), net, included in net income (144) 968
Realized and unrealized gains (losses), net, included in other comprehensive income 1,517 (4,116)
Transfers Into Level 3 8,430 [1] 2,079 [2]
Transfers out of Level 3 (148,266) [1] (55,854) [2]
Amortization included in net income 284 173
Asset Balance, beginning of period 157,808 201,861
Liability balance, beginning of period 33,446 375
Purchases 0 0
Settlements (33,162) (11)
Realized and unrealized gains (losses), net, included in net income 0 0
Realized and unrealized gains (losses), net, included in other comprehensive income 30 31
Transfers Into Level 3 0 [1] 0 [2]
Transfers out of Level 3 0 [1] 0 [2]
Liability balance, end of period 314 333
Corporate securities
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Asset Balance, beginning of period 106,412 117,164
Purchases 0 5,000
Disposals (7,184) (2,241)
Realized and unrealized gains (losses), net, included in net income 1 1,000
Realized and unrealized gains (losses), net, included in other comprehensive income 1,577 (965)
Transfers Into Level 3 8,430 [1] 2,079 [2]
Transfers out of Level 3 (15,295) [1] (27,433) [2]
Amortization included in net income (17) 1
Asset Balance, beginning of period 93,924 94,535
Residential mortgage-backed securities [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Asset Balance, beginning of period 7,711 11,895
Purchases 0 0
Disposals 0 (2,704)
Realized and unrealized gains (losses), net, included in net income 0 0
Realized and unrealized gains (losses), net, included in other comprehensive income 0 107
Transfers Into Level 3 0 [1] 0 [2]
Transfers out of Level 3 (7,711) [1] 0 [2]
Amortization included in net income 0 (40)
Asset Balance, beginning of period 0 9,044
Commercial mortgage-backed securities [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Asset Balance, beginning of period 27,899 32,088
Purchases 0 12,701
Disposals (156) (133)
Realized and unrealized gains (losses), net, included in net income 0 0
Realized and unrealized gains (losses), net, included in other comprehensive income (424) (494)
Transfers Into Level 3 0 [1] 0 [2]
Transfers out of Level 3 (14,055) [1] (16,236) [2]
Amortization included in net income (12) (17)
Asset Balance, beginning of period 13,252 28,897
Other asset backed securities [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Asset Balance, beginning of period 113,458 15,247
Purchases 16,709 33,391
Disposals (3,058) (1,300)
Realized and unrealized gains (losses), net, included in net income 0 528
Realized and unrealized gains (losses), net, included in other comprehensive income 630 (1,144)
Transfers Into Level 3 0 [1] 0 [2]
Transfers out of Level 3 (96,545) [1] (7,758) [2]
Amortization included in net income 311 226
Asset Balance, beginning of period 31,505 40,422
Collateralized debt obligation [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Asset Balance, beginning of period 270 1,220
Purchases 0 0
Disposals 0 0
Realized and unrealized gains (losses), net, included in net income (250) (560)
Realized and unrealized gains (losses), net, included in other comprehensive income 0 0
Transfers Into Level 3 0 [1] 0 [2]
Transfers out of Level 3 0 [1] 0 [2]
Amortization included in net income 0 0
Asset Balance, beginning of period 20 1,780
United States Government and agencies [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Asset Balance, beginning of period 12,588 8,188
Purchases 0 0
Disposals 0 0
Realized and unrealized gains (losses), net, included in net income 0 0
Realized and unrealized gains (losses), net, included in other comprehensive income 117 (104)
Transfers Into Level 3 0 [1] 0 [2]
Transfers out of Level 3 (4,010) [1] 0 [2]
Amortization included in net income 2 3
Asset Balance, beginning of period 8,697 8,295
State, municipal and other government [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Asset Balance, beginning of period 12,044 12,694
Purchases 0 0
Disposals (48) (45)
Realized and unrealized gains (losses), net, included in net income 0 0
Realized and unrealized gains (losses), net, included in other comprehensive income (47) (75)
Transfers Into Level 3 0 [1] 0 [2]
Transfers out of Level 3 (7,845) [1] (4,427) [2]
Amortization included in net income 0 0
Asset Balance, beginning of period 4,104 8,297
Non-redeemable preferred stock [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Asset Balance, beginning of period 14,447 9,150
Purchases 0 0
Disposals (5,105) 0
Realized and unrealized gains (losses), net, included in net income 105 0
Realized and unrealized gains (losses), net, included in other comprehensive income (336) (1,441)
Transfers Into Level 3 0 [1] 0 [2]
Transfers out of Level 3 (2,805) [1] 0 [2]
Amortization included in net income 0 0
Asset Balance, beginning of period 6,306 10,591
Index Annuity Embedded Derivatives [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Liability balance, beginning of period 302 375
Purchases 0 0
Settlements (18) (11)
Realized and unrealized gains (losses), net, included in net income 0 0
Realized and unrealized gains (losses), net, included in other comprehensive income 30 31
Transfers Into Level 3 0 [1] 0 [2]
Transfers out of Level 3 0 [1] 0 [2]
Liability balance, end of period 314 333
Make-whole premium on senior notes [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Liability balance, beginning of period 33,144  
Purchases 0  
Settlements (33,144)  
Realized and unrealized gains (losses), net, included in net income 0  
Realized and unrealized gains (losses), net, included in other comprehensive income 0  
Transfers Into Level 3 0 [1]  
Transfers out of Level 3 0 [1]  
Liability balance, end of period $ 0  
[1] During the first quarter of 2012, we began using an external pricing service with access to observable inputs for a portion of our Level 3 investments for which non-binding broker quotes were previously used to estimate fair value. We believe the change in pricing sources is appropriate, and consistent with our pricing waterfall policy to use higher level valuation methods when available. There were no transfers between Level 1 and Level 2 during 2012.
[2] Transfers into Level 3 represent assets previously priced using an external pricing service with access to observable inputs no longer available and therefore, were priced using non-binding broker quotes. Transfers out of Level 3 include those assets that we are now able to obtain pricing from a third party pricing vendor that uses observable inputs. There were no transfers between Level 1 and Level 2 during 2011.