Fair Value Measurements (Financial Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Assets:
Fair value of financial assets measured on recurring basis	$ 167,952	$ 55,034
Liabilities:
Fair value of financial liabilities measured on recurring basis	285,797	143,502
Acquisition-related contingent consideration—short-term
Liabilities:
Fair value of financial liabilities measured on recurring basis	108,778	65,265
Acquisition-related contingent consideration—long-term
Liabilities:
Fair value of financial liabilities measured on recurring basis	177,019	78,237
Money market funds
Assets:
Fair value of financial assets measured on recurring basis	65,500	51,145
Time deposits
Assets:
Fair value of financial assets measured on recurring basis	100,091
Equity securities
Assets:
Fair value of financial assets measured on recurring basis	2,361	3,889
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Fair value of financial assets measured on recurring basis	67,861	55,034
Liabilities:
Fair value of financial liabilities measured on recurring basis	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Acquisition-related contingent consideration—short-term
Liabilities:
Fair value of financial liabilities measured on recurring basis	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Acquisition-related contingent consideration—long-term
Liabilities:
Fair value of financial liabilities measured on recurring basis	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds
Assets:
Fair value of financial assets measured on recurring basis	65,500	51,145
Quoted Prices in Active Markets for Identical Assets (Level 1) | Time deposits
Assets:
Fair value of financial assets measured on recurring basis	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities
Assets:
Fair value of financial assets measured on recurring basis	2,361	3,889
Significant Other Observable Inputs (Level 2)
Assets:
Fair value of financial assets measured on recurring basis	100,091	0
Liabilities:
Fair value of financial liabilities measured on recurring basis	0	0
Significant Other Observable Inputs (Level 2) | Acquisition-related contingent consideration—short-term
Liabilities:
Fair value of financial liabilities measured on recurring basis	0	0
Significant Other Observable Inputs (Level 2) | Acquisition-related contingent consideration—long-term
Liabilities:
Fair value of financial liabilities measured on recurring basis	0	0
Significant Other Observable Inputs (Level 2) | Money market funds
Assets:
Fair value of financial assets measured on recurring basis	0	0
Significant Other Observable Inputs (Level 2) | Time deposits
Assets:
Fair value of financial assets measured on recurring basis	100,091
Significant Other Observable Inputs (Level 2) | Equity securities
Assets:
Fair value of financial assets measured on recurring basis	0	0
Significant Unobservable Inputs (Level 3)
Assets:
Fair value of financial assets measured on recurring basis	0	0
Liabilities:
Fair value of financial liabilities measured on recurring basis	285,797	143,502
Significant Unobservable Inputs (Level 3) | Acquisition-related contingent consideration—short-term
Liabilities:
Fair value of financial liabilities measured on recurring basis	108,778	65,265
Significant Unobservable Inputs (Level 3) | Acquisition-related contingent consideration—long-term
Liabilities:
Fair value of financial liabilities measured on recurring basis	177,019	78,237
Significant Unobservable Inputs (Level 3) | Money market funds
Assets:
Fair value of financial assets measured on recurring basis	0	0
Significant Unobservable Inputs (Level 3) | Time deposits
Assets:
Fair value of financial assets measured on recurring basis	0
Significant Unobservable Inputs (Level 3) | Equity securities
Assets:
Fair value of financial assets measured on recurring basis	$ 0	$ 0