Fair Value Measurements (Financial Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
ASSETS
Fair value of financial assets measured on recurring basis	$ 3,403	$ 846,369
Liabilities [Abstract]
Fair value of financial liabilities measured on recurring basis	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Acquisition-related contingent consideration - short-term [Member]
Liabilities [Abstract]
Acquisition-related contingent consideration - short-term	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Acquisition-related contingent consideration - long-term [Member]
Liabilities [Abstract]
Acquisition-related contingent consideration - long-term	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Guaranteed investment certificates original maturities of three months or more [Member]
ASSETS
Fair value of financial assets measured on recurring basis	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Money market funds [Member]
ASSETS
Fair value of financial assets measured on recurring basis		843,390
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity securities [Member]
ASSETS
Fair value of financial assets measured on recurring basis	3,403	2,979
Significant Other Observable Inputs (Level 2) [Member]
ASSETS
Fair value of financial assets measured on recurring basis	2,727	0
Liabilities [Abstract]
Fair value of financial liabilities measured on recurring basis	0	0
Significant Other Observable Inputs (Level 2) [Member] | Acquisition-related contingent consideration - short-term [Member]
Liabilities [Abstract]
Acquisition-related contingent consideration - short-term	0	0
Significant Other Observable Inputs (Level 2) [Member] | Acquisition-related contingent consideration - long-term [Member]
Liabilities [Abstract]
Acquisition-related contingent consideration - long-term	0	0
Significant Other Observable Inputs (Level 2) [Member] | Guaranteed investment certificates original maturities of three months or more [Member]
ASSETS
Fair value of financial assets measured on recurring basis	2,727
Significant Other Observable Inputs (Level 2) [Member] | Money market funds [Member]
ASSETS
Fair value of financial assets measured on recurring basis		0
Significant Other Observable Inputs (Level 2) [Member] | Equity securities [Member]
ASSETS
Fair value of financial assets measured on recurring basis	0	0
Significant Unobservable Inputs (Level 3) [Member]
ASSETS
Fair value of financial assets measured on recurring basis	0	0
Liabilities [Abstract]
Fair value of financial liabilities measured on recurring basis	13,317	4,747
Significant Unobservable Inputs (Level 3) [Member] | Acquisition-related contingent consideration - short-term [Member]
Liabilities [Abstract]
Acquisition-related contingent consideration - short-term	3,908	3,878
Significant Unobservable Inputs (Level 3) [Member] | Acquisition-related contingent consideration - long-term [Member]
Liabilities [Abstract]
Acquisition-related contingent consideration - long-term	9,409	869
Significant Unobservable Inputs (Level 3) [Member] | Guaranteed investment certificates original maturities of three months or more [Member]
ASSETS
Fair value of financial assets measured on recurring basis	0
Significant Unobservable Inputs (Level 3) [Member] | Money market funds [Member]
ASSETS
Fair value of financial assets measured on recurring basis		0
Significant Unobservable Inputs (Level 3) [Member] | Equity securities [Member]
ASSETS
Fair value of financial assets measured on recurring basis	0	0
Total [Member]
ASSETS
Fair value of financial assets measured on recurring basis	6,130	846,369
Liabilities [Abstract]
Fair value of financial liabilities measured on recurring basis	13,317	4,747
Total [Member] | Acquisition-related contingent consideration - short-term [Member]
Liabilities [Abstract]
Acquisition-related contingent consideration - short-term	3,908	3,878
Total [Member] | Acquisition-related contingent consideration - long-term [Member]
Liabilities [Abstract]
Acquisition-related contingent consideration - long-term	9,409	869
Total [Member] | Guaranteed investment certificates original maturities of three months or more [Member]
ASSETS
Fair value of financial assets measured on recurring basis	2,727
Total [Member] | Money market funds [Member]
ASSETS
Fair value of financial assets measured on recurring basis		843,390
Total [Member] | Equity securities [Member]
ASSETS
Fair value of financial assets measured on recurring basis	$ 3,403	$ 2,979