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Fair Value Measurements (Narrative) (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent consideration $ 18,800,000 $ 19,600,000
Cost method investments, fair value 12,300,000 12,300,000
Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent consideration 4,500,000 5,000,000
Non-financial Assets [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-financial assets $ 0 $ 0