Fair Value Measurements 1 (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Assets, Fair Value Disclosure [Abstract]
Money market funds	$ 539,859,000	$ 257,605,000
Equity securities	22,097,000	23,410,000
Fixed-income investment fund	27,747,000	27,158,000
Debt securities - U.S. and foreign governments, agencies, and municipalities	(112,217,000)	(95,396,000)
Corporate notes and bonds	31,467,000	16,343,000
Asset-backed securities	134,262,000	94,994,000
Interest rate swaps	15,465,000	10,280,000
Foreign Currency Contract Asset Fair Value Disclosure	4,230,000	2,887,000
Total Assets	887,344,000	528,073,000
Liabilities Fair Value Disclosure [Abstract]
Foreign exchange contracts	1,439,000	6,907,000
Liabilities Fair Value Disclosure	1,439,000	6,907,000
Investment Securities [Abstract]
Investment Held At Subsidiary	282,000,000	246,000,000
Cash and Cash Equivalents Held At Subsidiary	28,000,000	61,000,000
Short Term Investments Held At Subsidiary	11,000,000	27,000,000
Long-term Investments Held At Subsidiary	243,000,000	158,000,000
Derivatives, Fair Value [Line Items]
Total Derivative Assets	19,695,000	13,167,000
Total Derivative Liabilities	1,439,000	6,907,000
Total Net Derivative Assets	18,256,000	6,260,000
Derivative Credit Risk Related Contingent Features [Abstract]
Derivative Net Liability Position Aggregate Fair Value	1,000,000
Debt Due 2012 [Member]
General Fair Value Hedge Information Abstract
Interest Rate	4.625%
Debt Due 2018 [Member]
General Fair Value Hedge Information Abstract
Interest Rate	4.75%
Interest Rate Swap [Member]
General Fair Value Hedge Information Abstract
Notional Value	850,000,000
Interest Rate Swap [Member] | Interest Expense [Member]
Effect Of Fair Value Hedges On Results Of Operations [Abstract]
Change In Unrealized Gain (Loss) On Fair Value Hedging Instruments	(33,125,000)	(26,667,000)
Derivative Instruments Gain Recognized In Income	11,583,000	13,261,000
Interest Rate Swap [Member] | Designated As Hedging Instrument [Member] | Other Assets Member
Derivatives, Fair Value [Line Items]
Total Derivative Assets	15,465,000	10,280,000
Foreign Exchange Contract Member
Effect Of Cash Flow Hedges On Results Of Operations [Abstract]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	2,141,000	(470,000)
Cash Flow Hedge Gain Loss Reclassified To Earnings Net	(885,000)	572,000
Other Derivatives Not Designated As Hedging Instruments At Fair Value Net Total [Abstract]
Cash Flow Hedge Gain (Loss) Reclassified to SGA Expense, Net	(17,214,000)	(22,158,000)
Notional Amount Of Foreign Currency Derivatives	19,000,000	25,000,000
Foreign Exchange Contract Member | Revenues [Member]
Effect Of Cash Flow Hedges On Results Of Operations [Abstract]
Cash Flow Hedge Gain (Loss) Reclassified to Revenue, Net	(166,000)	1,024,000
Foreign Exchange Contract Member | Cost of Sales [Member]
Effect Of Cash Flow Hedges On Results Of Operations [Abstract]
Cash Flow Hedge Gain (Loss) Reclassified to Cost of Sales, Net	(719,000)	(452,000)
Foreign Exchange Contract Member | Designated As Hedging Instrument [Member] | Other Current Assets and Prepayments [Member]
Derivatives, Fair Value [Line Items]
Total Derivative Assets	780,000	160,000
Foreign Exchange Contract Member | Designated As Hedging Instrument [Member] | Accounts Payable And Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Total Derivative Liabilities	79,000	716,000
Foreign Exchange Contract Member | Derivatives not designated as hedging instrument [Member] | Other Current Assets and Prepayments [Member]
Derivatives, Fair Value [Line Items]
Total Derivative Assets	3,450,000	2,727,000
Foreign Exchange Contract Member | Derivatives not designated as hedging instrument [Member] | Accounts Payable And Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Total Derivative Liabilities	1,360,000	6,191,000
Foreign Exchange Contract Inventory [Member]
Other Derivatives Not Designated As Hedging Instruments At Fair Value Net Total [Abstract]
Foreign Currency Derivative Liabilities At Fair Value		1,000,000
Foreign Currency Derivative Assets at Fair Value	1,000,000
Foreign Exchange Contract Intercompany [Member]
Other Derivatives Not Designated As Hedging Instruments At Fair Value Net Total [Abstract]
Foreign Currency Derivative Liabilities At Fair Value		3,000,000
Foreign Currency Derivative Assets at Fair Value	2,000,000
Fair Value Inputs Level 1 Member
Assets, Fair Value Disclosure [Abstract]
Money market funds	239,157,000	256,074,000
Equity securities	0	0
Debt securities - U.S. and foreign governments, agencies, and municipalities	(93,175,000)	(74,425,000)
Corporate notes and bonds	0	0
Asset-backed securities	0	0
Interest rate swaps	0	0
Foreign Currency Contract Asset Fair Value Disclosure	0	0
Total Assets	332,332,000	330,499,000
Liabilities Fair Value Disclosure [Abstract]
Foreign exchange contracts	0	0
Liabilities Fair Value Disclosure	0	0
Fair Value Inputs Level 2 Member
Assets, Fair Value Disclosure [Abstract]
Money market funds	300,702,000	1,531,000
Equity securities	22,097,000	23,410,000
Fixed-income investment fund	27,747,000	27,158,000
Debt securities - U.S. and foreign governments, agencies, and municipalities	(19,042,000)	(20,971,000)
Corporate notes and bonds	31,467,000	16,343,000
Asset-backed securities	134,262,000	94,994,000
Interest rate swaps	15,465,000	10,280,000
Foreign Currency Contract Asset Fair Value Disclosure	4,230,000	2,887,000
Total Assets	555,012,000	197,574,000
Liabilities Fair Value Disclosure [Abstract]
Foreign exchange contracts	1,439,000	6,907,000
Liabilities Fair Value Disclosure	$ 1,439,000	$ 6,907,000