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FINANCIAL INSTRUMENTS - Narrative (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Contractual maturity of current available-for-sale securities (equal to or less than)     1 year    
Available-for-sale debt securities in an unrealized loss position for longer than twelve months $ 0   $ 0    
Gross realized gains 0 $ 0 0 $ 0  
Gross realized losses 0 $ 0 0 $ 0  
Contingent Consideration Arrangements          
Contingent consideration, maximum amount at balance sheet date 32,000,000   32,000,000    
Contingent consideration, fair value at balance sheet date with a maximum limit 2,000,000   2,000,000    
Contingent consideration, at fair value, current 2,000,000   2,000,000   $ 600,000
Contingent consideration, at fair value, noncurrent 0   0   2,000,000
Assets measured at fair value on a nonrecurring basis          
Equity securities without readily determinable fair values $ 216,400,000   $ 216,400,000   $ 63,400,000
Measurement Input, Discount Rate | Contingent Consideration Arrangements          
Contingent Consideration Arrangements          
Contingent consideration, discount rates (as a percent) 0.12   0.12   0.12