Fair Value Measurement (Assets And Liabilities Carried At Fair Value) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 163,386	$ 301,714
Short-term investments	582	455
Foreign currency future	(561)
Deferred compensation	(2,063)
Contingent consideration	(9,529)
Quoted Prices In Active Markets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	160,513	273,926
Short-term investments	0	0
Foreign currency future	0
Deferred compensation	0
Contingent consideration	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	2,873	27,788
Short-term investments	582	455
Foreign currency future	(561)
Deferred compensation	0
Contingent consideration	0
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Short-term investments	0	0
Foreign currency future	0
Deferred compensation	(2,063)
Contingent consideration	$ (9,529)