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Fair Value Measurements (Fair Value Of Financial Assets And Liabilities) (Details) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2011
Jun. 30, 2011
Dec. 31, 2010
Mar. 31, 2011
Fair value of cash and cash equivalents $ 112,956,000 $ 112,956,000 $ 88,079,000  
Fair value of available-for-sale securities 299,170,000 299,170,000 314,204,000  
Deferred compensation asset 3,379,000 [1] 3,379,000 [1] 2,748,000 [1]  
Forward foreign currency exchange contract asset     1,496,000 [2]  
Fair value of financial assets, total 415,505,000 415,505,000 406,527,000  
Deferred compensation liability 8,070,000 [3] 8,070,000 [3] 5,560,000 [3]  
Forward foreign currency exchange contract liability 6,265,000 [2] 6,265,000 [2] 1,673,000 [2]  
Contingent acquisition consideration payable 38,786,000 [4] 38,786,000 [4] 43,718,000 [4]  
Fair value of financial liabilities, total 53,121,000 53,121,000 50,951,000  
Percentage of deferred compensation asset included in other assets 93.00% 93.00% 97.00%  
Percentage of deferred compensation liability included in other long-term liabilities 92.00% 92.00% 94.00%  
Percentage of contingent acquisition consideration payable included in other long-term liabilities 92.00% 92.00% 80.00%  
Percentage of contingent acquisition consideration payable included in accounts payable, accrued liabilities and other current assets   8.00% 20.00%  
Contingent acquisition consideration payable resulting from acquisition 4,100,000 4,900,000    
Reduction in goodwill amount       300,000
Available-For-Sale Of Securities Short-Term [Member] | Commercial Paper [Member]
       
Fair value of available-for-sale securities 35,725,000 35,725,000 27,457,000  
Available-For-Sale Of Securities Short-Term [Member] | Commercial Paper [Member] | Quoted Price In Active Markets For Identical Assets (Level 1) [Member]
       
Fair value of available-for-sale securities 0 0 0  
Available-For-Sale Of Securities Short-Term [Member] | Commercial Paper [Member] | Significant Other Observable Inputs (Level 2) [Member]
       
Fair value of available-for-sale securities 35,725,000 35,725,000 27,457,000  
Available-For-Sale Of Securities Short-Term [Member] | Commercial Paper [Member] | Significant Unobservable Inputs (Level 3) [Member]
       
Fair value of available-for-sale securities 0 0 0  
Available-For-Sale Of Securities Short-Term [Member] | Corporate Securities [Member]
       
Fair value of available-for-sale securities 73,466,000 73,466,000 80,186,000  
Available-For-Sale Of Securities Short-Term [Member] | Corporate Securities [Member] | Quoted Price In Active Markets For Identical Assets (Level 1) [Member]
       
Fair value of available-for-sale securities 0 0 0  
Available-For-Sale Of Securities Short-Term [Member] | Corporate Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
       
Fair value of available-for-sale securities 73,466,000 73,466,000 80,186,000  
Available-For-Sale Of Securities Short-Term [Member] | Corporate Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
       
Fair value of available-for-sale securities 0 0 0  
Available-For-Sale Of Securities Short-Term [Member] | U.S. Government Agency Securities [Member]
       
Fair value of available-for-sale securities 10,011,000 10,011,000 48,545,000  
Available-For-Sale Of Securities Short-Term [Member] | U.S. Government Agency Securities [Member] | Quoted Price In Active Markets For Identical Assets (Level 1) [Member]
       
Fair value of available-for-sale securities 0 0 0  
Available-For-Sale Of Securities Short-Term [Member] | U.S. Government Agency Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
       
Fair value of available-for-sale securities 10,011,000 10,011,000 48,545,000  
Available-For-Sale Of Securities Short-Term [Member] | U.S. Government Agency Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
       
Fair value of available-for-sale securities 0 0 0  
Available-For-Sale Of Securities Short-Term [Member] | Certificates Of Deposit [Member]
       
Fair value of available-for-sale securities 26,762,000 26,762,000 29,845,000  
Available-For-Sale Of Securities Short-Term [Member] | Certificates Of Deposit [Member] | Quoted Price In Active Markets For Identical Assets (Level 1) [Member]
       
Fair value of available-for-sale securities 0 0 0  
Available-For-Sale Of Securities Short-Term [Member] | Certificates Of Deposit [Member] | Significant Other Observable Inputs (Level 2) [Member]
       
Fair value of available-for-sale securities 26,762,000 26,762,000 29,845,000  
Available-For-Sale Of Securities Short-Term [Member] | Certificates Of Deposit [Member] | Significant Unobservable Inputs (Level 3) [Member]
       
Fair value of available-for-sale securities 0 0 0  
Available-For-Sale Of Securities Long-Term [Member] | Commercial Paper [Member]
       
Fair value of available-for-sale securities 0 0 0  
Available-For-Sale Of Securities Long-Term [Member] | Commercial Paper [Member] | Quoted Price In Active Markets For Identical Assets (Level 1) [Member]
       
Fair value of available-for-sale securities 0 0 0  
Available-For-Sale Of Securities Long-Term [Member] | Commercial Paper [Member] | Significant Other Observable Inputs (Level 2) [Member]
       
Fair value of available-for-sale securities 0 0 0  
Available-For-Sale Of Securities Long-Term [Member] | Commercial Paper [Member] | Significant Unobservable Inputs (Level 3) [Member]
       
Fair value of available-for-sale securities 0 0 0  
Available-For-Sale Of Securities Long-Term [Member] | Corporate Securities [Member]
       
Fair value of available-for-sale securities 66,366,000 66,366,000 72,329,000  
Available-For-Sale Of Securities Long-Term [Member] | Corporate Securities [Member] | Quoted Price In Active Markets For Identical Assets (Level 1) [Member]
       
Fair value of available-for-sale securities 0 0 0  
Available-For-Sale Of Securities Long-Term [Member] | Corporate Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
       
Fair value of available-for-sale securities 66,366,000 66,366,000 72,329,000  
Available-For-Sale Of Securities Long-Term [Member] | Corporate Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
       
Fair value of available-for-sale securities 0 0 0  
Available-For-Sale Of Securities Long-Term [Member] | U.S. Government Agency Securities [Member]
       
Fair value of available-for-sale securities 53,366,000 53,366,000 29,994,000  
Available-For-Sale Of Securities Long-Term [Member] | U.S. Government Agency Securities [Member] | Quoted Price In Active Markets For Identical Assets (Level 1) [Member]
       
Fair value of available-for-sale securities 0 0 0  
Available-For-Sale Of Securities Long-Term [Member] | U.S. Government Agency Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
       
Fair value of available-for-sale securities 53,366,000 53,366,000 29,994,000  
Available-For-Sale Of Securities Long-Term [Member] | U.S. Government Agency Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
       
Fair value of available-for-sale securities 0 0 0  
Available-For-Sale Of Securities Long-Term [Member] | Certificates Of Deposit [Member]
       
Fair value of available-for-sale securities 33,474,000 33,474,000 25,848,000  
Available-For-Sale Of Securities Long-Term [Member] | Certificates Of Deposit [Member] | Quoted Price In Active Markets For Identical Assets (Level 1) [Member]
       
Fair value of available-for-sale securities 0 0 0  
Available-For-Sale Of Securities Long-Term [Member] | Certificates Of Deposit [Member] | Significant Other Observable Inputs (Level 2) [Member]
       
Fair value of available-for-sale securities 33,474,000 33,474,000 25,848,000  
Available-For-Sale Of Securities Long-Term [Member] | Certificates Of Deposit [Member] | Significant Unobservable Inputs (Level 3) [Member]
       
Fair value of available-for-sale securities 0 0 0  
Overnight Deposits [Member]
       
Fair value of cash and cash equivalents 98,192,000 98,192,000 51,647,000  
Overnight Deposits [Member] | Quoted Price In Active Markets For Identical Assets (Level 1) [Member]
       
Fair value of cash and cash equivalents 98,192,000 98,192,000 51,647,000  
Overnight Deposits [Member] | Significant Other Observable Inputs (Level 2) [Member]
       
Fair value of cash and cash equivalents 0 0 0  
Overnight Deposits [Member] | Significant Unobservable Inputs (Level 3) [Member]
       
Fair value of cash and cash equivalents 0 0 0  
Money Market Instruments [Member]
       
Fair value of cash and cash equivalents 14,764,000 14,764,000 36,432,000  
Money Market Instruments [Member] | Quoted Price In Active Markets For Identical Assets (Level 1) [Member]
       
Fair value of cash and cash equivalents 0 0 0  
Money Market Instruments [Member] | Significant Other Observable Inputs (Level 2) [Member]
       
Fair value of cash and cash equivalents 14,764,000 14,764,000 36,432,000  
Money Market Instruments [Member] | Significant Unobservable Inputs (Level 3) [Member]
       
Fair value of cash and cash equivalents 0 0 0  
Quoted Price In Active Markets For Identical Assets (Level 1) [Member]
       
Fair value of cash and cash equivalents 98,192,000 98,192,000 51,647,000  
Fair value of available-for-sale securities 0 0 0  
Deferred compensation asset 0 [1] 0 [1] 0 [1]  
Forward foreign currency exchange contract asset     0 [2]  
Fair value of financial assets, total 98,192,000 98,192,000 51,647,000  
Deferred compensation liability 4,692,000 [3] 4,692,000 [3] 2,812,000 [3]  
Forward foreign currency exchange contract liability 0 [2] 0 [2] 0 [2]  
Contingent acquisition consideration payable 0 [4] 0 [4] 0 [4]  
Fair value of financial liabilities, total 4,692,000 4,692,000 2,812,000  
Significant Other Observable Inputs (Level 2) [Member]
       
Fair value of cash and cash equivalents 14,764,000 14,764,000 36,432,000  
Fair value of available-for-sale securities 299,170,000 299,170,000 314,204,000  
Deferred compensation asset 3,379,000 [1] 3,379,000 [1] 2,748,000 [1]  
Forward foreign currency exchange contract asset     1,496,000 [2]  
Fair value of financial assets, total 317,313,000 317,313,000 354,880,000  
Deferred compensation liability 3,378,000 [3] 3,378,000 [3] 2,748,000 [3]  
Forward foreign currency exchange contract liability 6,265,000 [2] 6,265,000 [2] 1,673,000 [2]  
Contingent acquisition consideration payable 0 [4] 0 [4] 0 [4]  
Fair value of financial liabilities, total 9,643,000 9,643,000 4,421,000  
Significant Unobservable Inputs (Level 3) [Member]
       
Fair value of cash and cash equivalents 0 0 0  
Fair value of available-for-sale securities 0 0 0  
Deferred compensation asset 0 [1] 0 [1] 0 [1]  
Forward foreign currency exchange contract asset     0 [2]  
Fair value of financial assets, total     0  
Deferred compensation liability 0 [3] 0 [3] 0 [3]  
Forward foreign currency exchange contract liability 0 [2] 0 [2] 0 [2]  
Contingent acquisition consideration payable 38,786,000 [4] 38,786,000 [4] 43,718,000 [4]  
Fair value of financial liabilities, total $ 38,786,000 $ 38,786,000 $ 43,718,000  
[1] At June 30, 2011 and December 31, 2010, 93% and 97% of the deferred compensation asset balance was included in other assets and the remainder of the balance was included in other current assets on the Company's Condensed Consolidated Balance Sheets.
[2] See Note 8 for further information regarding the Company's derivative instruments.
[3] At June 30, 2011 and December 31, 2010, 92% and 94%, respectively, of the deferred compensation liability balance was included in other long-term liabilities and the remainder was included in accounts payable and accrued liabilities on the Condensed Company's Consolidated Balance Sheets.
[4] At June 30, 2011 and December 31, 2010, 92% and 80%, respectively, of the contingent acquisition consideration payable was included in other long-term liabilities, respectively, and 8% and 20%, respectively, was included in accounts payable, accrued liabilities and other current assets.