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Fair Value Measurements (Details) (USD $)
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Debt Instrument [Line Items]     
Notional Amount Of Derivatives$ 850,000,000 $ 850,000,000  
Weighted Average Spread Over LiborLIBOR plus 305 Libor plus 249 basis    
Derivatives     
Subsidiary ILC cash and cash equivalents21,000,000 21,000,000 61,000,000
Subsidiary ILC short term investments53,000,000 53,000,000 27,000,000
Subsidiary ILC long term investments236,000,000 236,000,000 158,000,000
Subsidiary ILC total investments310,000,000 310,000,000 246,000,000
Fair Value of Derivative Instruments [Abstract]     
Fair Value Asset Derivatives Designated Foreign Exchange Contracts691,000 691,000 160,000
Fair Value Asset Derivatives Designated Interest Rate Swaps18,795,000 18,795,000 10,280,000
Fair Value Liability Derivatives Designated Foreign Exchange Contracts158,000 158,000 716,000
Derivative Asset Not Designated As Hedging Instruments Fair Value1,943,000 1,943,000 2,727,000
Derivative Liability Not Designated Foreign Exchange Contracts2,944,000 2,944,000 6,191,000
Derivative Assets21,429,000 21,429,000 13,167,000
Derivative Assets Liabilities At Fair Value Net18,327,000 18,327,000 6,260,000
Derivative Liability, Fair Value, Net    1,000,000
Derivative Asset, Fair Value, Net1,000,000 1,000,000  
Derivative Liability Fair Value Of Intercompany Loans Net(1,000,000) (1,000,000) (3,000,000)
Derivatives In Fair Value Hedging Relationships [Abstract]     
Derivative gain (loss) recognized in interest expense3,448,0002,699,0008,406,00011,318,000 
Hedged item income (expense) recognized in interest expense(10,109,000)(5,792,000)(23,016,000)(22,042,000) 
Derivatives In Cash Flow Hedging Relationships Currency [Abstract]     
Total notional amount of outstanding contracts in cash flow hedging relationships28,000,000 28,000,000 25,000,000
Derivative gain (loss) recognized in OCI for hedges recorded to revenue (effective portion)1,746,000(1,945,000)2,049,000(808,000) 
Derivative gain (loss) recognized in OCI for hedges recorded to cost of sales (effective portion)00   
Derivative gain (loss) recognized in OCI for hedges (effective portion)00   
Derivative gain (loss) reclassified from AOCI to income for hedges recorded to revenue (effective portion)(129,000)509,000(260,000)976,000 
Derivative gain (loss) reclassified from AOCI to income for hedges recorded to cost of sales (effective portion)(146,000)(119,000)(700,000)(277,000) 
Derivative gain (loss) reclassified from AOCI to income for hedges (effective portion)(275,000)390,000(960,000)699,000 
Derivatives Not Designated As Hedging Relationships [Abstract]     
Derivative gain (loss) recognized in income2,090,000(6,364,000)(18,770,000)(13,835,000) 
Amount of collateral that would be required to be posted if our long-term senior unsecured debt ratings was to have fallen below BB-/Ba32,000,000 2,000,000  
General Fair Value Hedge Information [Abstract]     
Notional Amount Of Derivatives850,000,000 850,000,000  
Weighted Average Spread Over LiborLIBOR plus 305 Libor plus 249 basis    
Debt Due 2012 [Member]
     
Debt Instrument [Line Items]     
Notional Amount Of Derivatives400,000,000 400,000,000  
Debt Instrument Face Amount400,000,000 400,000,000  
Debt Instrument Interest Rate Stated Percentage4.625% 4.625%  
General Fair Value Hedge Information [Abstract]     
Notional Amount Of Derivatives400,000,000 400,000,000  
Debt Instrument Interest Rate Stated Percentage4.625% 4.625%  
Debt Due 2014 [Member]
     
Debt Instrument [Line Items]     
Notional Amount Of Derivatives450,000,000 450,000,000  
Debt Instrument Face Amount450,000,000 450,000,000  
Debt Instrument Interest Rate Stated Percentage4.875% 4.875%  
General Fair Value Hedge Information [Abstract]     
Notional Amount Of Derivatives450,000,000 450,000,000  
Debt Instrument Interest Rate Stated Percentage4.875% 4.875%  
Fair Value, Inputs, Level 1 [Member]
     
Investment securities     
Money market funds206,662,000 206,662,000 256,074,000
Equity Securities0 0 0
U.S. Government and agency issued debt115,376,000 115,376,000 74,425,000
Corporate notes and bonds0 0 0
Mortgage-backed securities0 0 0
Derivatives     
Interest rate swaps0 0 0
Foreign exchange contracts0 0 0
Total assets322,038,000 322,038,000 330,499,000
Derivatives     
Foreign exchange contracts0 0 0
Total liabilities0 0 0
Fair Value, Inputs, Level 2 [Member]
     
Investment securities     
Money market funds17,349,000 17,349,000 1,531,000
Equity Securities20,267,000 20,267,000 23,410,000
U.S. Government and agency issued debt29,404,000 29,404,000 30,725,000
Corporate notes and bonds34,885,000 34,885,000 22,262,000
Mortgage-backed securities150,930,000 150,930,000 106,479,000
Derivatives     
Interest rate swaps18,795,000 18,795,000 10,280,000
Foreign exchange contracts2,634,000 2,634,000 2,887,000
Total assets274,264,000 274,264,000 197,574,000
Derivatives     
Foreign exchange contracts3,102,000 3,102,000 6,907,000
Total liabilities3,102,000 3,102,000 6,907,000
Fair Value, Inputs, Level 3 [Member]
     
Investment securities     
Money market funds0 0 0
Equity Securities0 0 0
U.S. Government and agency issued debt0 0 0
Corporate notes and bonds0 0 0
Mortgage-backed securities0 0 0
Derivatives     
Interest rate swaps0 0 0
Foreign exchange contracts0 0 0
Total assets0 0 0
Derivatives     
Foreign exchange contracts0 0 0
Total liabilities0 0 0
Total Level [Member]
     
Investment securities     
Money market funds224,011,000 224,011,000 257,605,000
Equity Securities20,267,000 20,267,000 23,410,000
U.S. Government and agency issued debt144,780,000 144,780,000 105,150,000
Corporate notes and bonds34,885,000 34,885,000 22,262,000
Mortgage-backed securities150,930,000 150,930,000 106,479,000
Derivatives     
Interest rate swaps18,795,000 18,795,000 10,280,000
Foreign exchange contracts2,634,000 2,634,000 2,887,000
Total assets596,302,000 596,302,000 528,073,000
Derivatives     
Foreign exchange contracts3,102,000 3,102,000 6,907,000
Total liabilities3,102,000 3,102,000 6,907,000
Carrying (Reported) Amount, Fair Value Disclosure [Member]
     
Fair Value of Financial Instruments     
Investment securities566,582,000[1] 566,582,000[1] 512,771,000[1]
Loans receivable444,727,000[1] 444,727,000[1] 459,235,000[1]
Derivatives, net18,327,000[1] 18,327,000[1] 6,260,000[1]
Long-term debt(4,276,119,000)[1] (4,276,119,000)[1] (4,301,337,000)[1]
Portion at Fair Value, Fair Value Disclosure [Member]
     
Fair Value of Financial Instruments     
Investment securities574,873,000 574,873,000 514,906,000
Loans receivable444,727,000 444,727,000 459,235,000
Derivatives, net18,327,000 18,327,000 6,260,000
Long-term debt$ (4,391,233,000) $ (4,391,233,000) $ (4,388,923,000)
[1]Carrying value includes accrued interest and deferred fee income, where applicable.