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Note 4 - Fair Value of Financial Instruments Rollforward of Level III Assets and Liabilities Fair Value Disclosure (Details) (Fair Value, Measurements, Recurring, USD $)
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Fair Value Level III Assets and Liabilities [Roll Forward]    
Fair Value, Transfers Between Level 1 And Level 2, Amount  $ 0$ 0
Fair Value, Inputs, Level 3 | State and municipal obligations
    
Fair Value Level III Assets and Liabilities [Roll Forward]    
Beginning Balance Level III Assets23,600,00024,400,00023,200,00024,400,000
VIE Consolidation Assets   0[1]
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings200,000[2]0[3]600,0000[4]
Purchases Level III Assets39,100,000039,100,0000
Sales Level III Assets0000
Issuances Level III Assets0000
Settlements Level III Assets300,0000300,0000
Transfers Into (Out of) Level III Assets0[5]0[6]00[6]
Ending Balance Level III Assets62,600,00024,400,00062,600,00024,400,000
Fair Value, Inputs, Level 3 | RMBS
    
Fair Value Level III Assets and Liabilities [Roll Forward]    
Beginning Balance Level III Assets61,400,00057,300,00052,500,0000
VIE Consolidation Assets   44,300,000[1]
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings(12,000,000)[2]2,300,000[3](400,000)21,000,000[4]
Purchases Level III Assets0000
Sales Level III Assets(1,600,000)3,700,00009,400,000
Issuances Level III Assets0000
Settlements Level III Assets2,200,00003,300,0000
Transfers Into (Out of) Level III Assets0[5]0[6]00
Ending Balance Level III Assets48,800,00055,900,00048,800,00055,900,000
Fair Value, Inputs, Level 3 | CMBS
    
Fair Value Level III Assets and Liabilities [Roll Forward]    
Beginning Balance Level III Assets29,400,00023,200,00023,000,0000
VIE Consolidation Assets   23,800,000[1]
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings8,600,000[2](200,000)[3]15,000,000(800,000)[4]
Purchases Level III Assets0000
Sales Level III Assets0000
Issuances Level III Assets0000
Settlements Level III Assets0000
Transfers Into (Out of) Level III Assets0[5]0[6]00
Ending Balance Level III Assets38,000,00023,000,00038,000,00023,000,000
Fair Value, Inputs, Level 3 | CDO
    
Fair Value Level III Assets and Liabilities [Roll Forward]    
Beginning Balance Level III Assets3,900,0002,400,0002,400,0000
VIE Consolidation Assets   3,800,000[1]
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings1,400,000[2](100,000)[3]2,700,000(1,600,000)[4]
Purchases Level III Assets0000
Sales Level III Assets100,000(100,000)0(200,000)
Issuances Level III Assets0000
Settlements Level III Assets(200,000)0(300,000)0
Transfers Into (Out of) Level III Assets0[5]0[6]00
Ending Balance Level III Assets5,400,0002,400,0005,400,0002,400,000
Fair Value, Inputs, Level 3 | Other ABS
    
Fair Value Level III Assets and Liabilities [Roll Forward]    
Beginning Balance Level III Assets2,000,0003,300,0003,300,0000
VIE Consolidation Assets   3,500,000[1]
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings700,000[2]0[3](600,000)(200,000)[4]
Purchases Level III Assets0000
Sales Level III Assets0000
Issuances Level III Assets0000
Settlements Level III Assets0000
Transfers Into (Out of) Level III Assets0[5]0[6]00
Ending Balance Level III Assets2,700,0003,300,0002,700,0003,300,000
Fair Value, Inputs, Level 3 | Hybrid securities
    
Fair Value Level III Assets and Liabilities [Roll Forward]    
Beginning Balance Level III Assets 00600,000
VIE Consolidation Assets   0[1]
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings 0[3](100,000)0[4]
Purchases Level III Assets 0700,0000
Sales Level III Assets 000
Issuances Level III Assets 000
Settlements Level III Assets 000
Transfers Into (Out of) Level III Assets 0[6](600,000)(600,000)
Ending Balance Level III Assets0000
Fair Value, Inputs, Level 3 | Equity securities
    
Fair Value Level III Assets and Liabilities [Roll Forward]    
Beginning Balance Level III Assets5,600,0001,700,0002,900,0001,700,000
VIE Consolidation Assets   0[1]
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings(900,000)[2]400,000[3](1,200,000)(100,000)[4]
Purchases Level III Assets500,00003,700,000200,000
Sales Level III Assets400,0000600,0000
Issuances Level III Assets0000
Settlements Level III Assets0000
Transfers Into (Out of) Level III Assets(2,000,000)[5]100,000[6](2,000,000)400,000
Ending Balance Level III Assets2,800,0002,200,0002,800,0002,200,000
Fair Value, Inputs, Level 3 | Other investments
    
Fair Value Level III Assets and Liabilities [Roll Forward]    
Beginning Balance Level III Assets5,800,0004,800,0004,600,0003,800,000
VIE Consolidation Assets   3,700,000[1]
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings600,000[2]0[3]2,600,000(1,700,000)[4]
Purchases Level III Assets0000
Sales Level III Assets100,000100,000600,000900,000
Issuances Level III Assets0000
Settlements Level III Assets100,0000400,000200,000
Transfers Into (Out of) Level III Assets0[5]0[6]00
Ending Balance Level III Assets6,200,0004,700,0006,200,0004,700,000
Fair Value, Inputs, Level 3 | Investments
    
Fair Value Level III Assets and Liabilities [Roll Forward]    
Beginning Balance Level III Assets131,700,000117,100,000111,900,00030,500,000
VIE Consolidation Assets   79,100,000
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings(1,400,000)[7]2,400,000[3]18,600,000[2]16,600,000
Purchases Level III Assets39,600,000043,500,000200,000
Sales Level III Assets(1,000,000)3,700,0001,200,00010,100,000
Issuances Level III Assets0000
Settlements Level III Assets2,400,00003,700,000200,000
Transfers Into (Out of) Level III Assets(2,000,000)[5]100,000[6](2,600,000)[6](200,000)
Ending Balance Level III Assets166,500,000115,900,000166,500,000115,900,000
Unrealized Gains (Losses) Recorded in Earnings on Level III Assets Still Held(1,500,000)1,500,00017,100,00013,100,000
Fair Value, Inputs, Level 3 | NIMS derivative assets
    
Fair Value Level III Assets and Liabilities [Roll Forward]    
Beginning Balance Level III Assets4,700,000 11,700,000 
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings100,000[2] (1,900,000) 
Purchases Level III Assets100,000 200,000 
Sales Level III Assets0 0 
Issuances Level III Assets0 0 
Settlements Level III Assets0 4,700,000 
Transfers Into (Out of) Level III Assets0[5] (400,000) 
Ending Balance Level III Assets4,900,000 4,900,000 
Unrealized Gains (Losses) Recorded in Earnings on Level III Assets Still Held200,000 (1,800,000) 
Fair Value, Inputs, Level 3 | NIMS and CPS Derivative Assets
    
Fair Value Level III Assets and Liabilities [Roll Forward]    
Beginning Balance Level III Assets 11,300,000 44,700,000
VIE Consolidation Assets   0
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings (500,000)[3] (7,800,000)
Purchases Level III Assets 700,000 900,000
Sales Level III Assets 0 100,000
Issuances Level III Assets 0 0
Settlements Level III Assets 0 26,200,000
Transfers Into (Out of) Level III Assets 0[6] 0
Ending Balance Level III Assets 11,500,000 11,500,000
Unrealized Gains (Losses) Recorded in Earnings on Level III Assets Still Held (300,000) (700,000)
Fair Value, Inputs, Level 3 | Other assets
    
Fair Value Level III Assets and Liabilities [Roll Forward]    
Beginning Balance Level III Assets113,700,000116,100,000109,700,0000
VIE Consolidation Assets   119,700,000
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings(10,300,000)[2]3,700,000[3]8,000,00014,600,000
Purchases Level III Assets0000
Sales Level III Assets0000
Issuances Level III Assets0000
Settlements Level III Assets6,600,0007,200,00020,900,00021,700,000
Transfers Into (Out of) Level III Assets0[5]0[6]00
Ending Balance Level III Assets96,800,000112,600,00096,800,000112,600,000
Unrealized Gains (Losses) Recorded in Earnings on Level III Assets Still Held(13,300,000)300,000(1,300,000)3,600,000
Fair Value, Inputs, Level 3 | Total Level III Assets
    
Fair Value Level III Assets and Liabilities [Roll Forward]    
Beginning Balance Level III Assets250,100,000244,500,000233,300,00075,200,000
VIE Consolidation Assets   198,800,000
Realized and Unrealized Gains (Losses) Level III Assets Included in Earnings(11,600,000)[7]5,600,000[3]24,700,000[2]23,400,000
Purchases Level III Assets39,700,000700,00043,700,0001,100,000
Sales Level III Assets(1,000,000)3,700,0001,200,00010,200,000
Issuances Level III Assets0000
Settlements Level III Assets9,000,0007,200,00029,300,00048,100,000
Transfers Into (Out of) Level III Assets(2,000,000)[5]100,000[6](3,000,000)[6](200,000)
Ending Balance Level III Assets268,200,000240,000,000268,200,000240,000,000
Fair Value, Inputs, Level 3 | Derivative liabilities net [Member]
    
Fair Value Level III Assets and Liabilities [Roll Forward]    
Beginning Balance Level III Liabilities291,500,000737,400,000709,100,000214,900,000
VIE Consolidation, Liabilities   (51,800,000)
Realized and Unrealized Gains (Losses) Included in Earnings Level III Liabilities125,800,000[2]230,000,000[3]558,800,000(365,200,000)
Purchases Level III Liabilities0000
Sales Level III Liabilities0000
Issuances Level III Liabilities0000
Settlements Level III Liabilities(8,100,000)(7,800,000)(23,500,000)13,100,000
Transfers Into (Out of) Level III Liabilities0[5]0[6]00
Ending Balance Level III Liabilities173,800,000515,200,000173,800,000515,200,000
Unrealized Gains (Losses) Recorded in Earnings on Level III Liabilities Still Held117,100,000221,300,000515,900,000(414,200,000)
Fair Value, Inputs, Level 3 | VIE debt
    
Fair Value Level III Assets and Liabilities [Roll Forward]    
Beginning Balance Level III Liabilities393,700,000627,600,000520,100,000296,100,000
VIE Consolidation, Liabilities   253,500,000
Realized and Unrealized Gains (Losses) Included in Earnings Level III Liabilities92,200,000[2]11,100,000[3]121,100,000(159,300,000)
Purchases Level III Liabilities0000
Sales Level III Liabilities0000
Issuances Level III Liabilities0000
Settlements Level III Liabilities28,100,000120,200,000125,600,000212,600,000
Transfers Into (Out of) Level III Liabilities0[5]0[6]00
Ending Balance Level III Liabilities273,400,000496,300,000273,400,000496,300,000
Unrealized Gains (Losses) Recorded in Earnings on Level III Liabilities Still Held92,300,000(4,100,000)144,600,000(28,600,000)
Fair Value, Inputs, Level 3 | Total Level III liabilities net [Member]
    
Fair Value Level III Assets and Liabilities [Roll Forward]    
Beginning Balance Level III Liabilities685,200,0001,365,000,0001,229,200,000511,000,000
VIE Consolidation, Liabilities   201,700,000
Realized and Unrealized Gains (Losses) Included in Earnings Level III Liabilities218,000,000[7]241,100,000[3]679,900,000[2]524,500,000
Purchases Level III Liabilities0000
Sales Level III Liabilities0000
Issuances Level III Liabilities0000
Settlements Level III Liabilities20,000,000112,400,000102,100,000225,700,000
Transfers Into (Out of) Level III Liabilities0[5]0[6]0[6]0
Ending Balance Level III Liabilities$ 447,200,000$ 1,011,500,000$ 447,200,000$ 1,011,500,000
[1]Represents the impact of our adoption of the accounting standard update regarding improvements to financial reporting by enterprises involving VIEs.
[2]Includes unrealized gains (losses) relating to assets and liabilities still held as of September 30, 2011, as follows: $17.1 million for investments, $(1.8) million for NIMS derivative assets, $(1.3) million for other assets, $515.9 million for derivative liabilities, and $144.6 million for VIE debt.
[3]Includes unrealized gains (losses) relating to assets and liabilities still held as of September 30, 2010, as follows: $1.5 million for investments, $(0.3) million for NIMS and CPS derivative assets, $0.3 million for other assets, $221.3 million for derivative liabilities, and $(4.1) million for VIE debt.
[4]Includes unrealized gains (losses) relating to assets and liabilities still held as of September 30, 2010, as follows: $13.1 million for investments, $(0.7) million for NIMS and CPS derivative assets, $3.6 million for other assets, $(414.2) million for derivative liabilities, and $(28.6) million for VIE debt.
[5])Transfers are recognized at the end of the period as the availability of market observed inputs change from period to perio
[6]Transfers are recognized at the end of the period as the availability of market observed inputs change from period to period.
[7])Includes unrealized gains (losses) relating to assets and liabilities still held as of September 30, 2011, as follows: $(1.5) million for investments, $0.2 million for NIMS derivative assets, $(13.3) million for other assets, $117.1 million for derivative liabilities, and $92.3 million for VIE deb