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Fair Value (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Realized and Unrealized Gains and Losses on Available For Sales Securities $ 0 $ 0 $ 0
Financial instruments measured at fair value, on a recurring basis      
Derivative Liability, Fair Value, Gross Liability (6,100,000) $ 0  
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High $ 34,100,000    
Document Fiscal Year Focus 2016    
Loss Contingency, Date of Dismissal Dec. 31, 2018    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings $ 100,000    
Fair Value, Recurring [Member]      
Financial instruments measured at fair value, on a recurring basis      
Trading securities 12,400,000    
Available-for-sale Securities, Noncurrent 3,300,000    
Assets, Fair Value Disclosure 15,700,000    
Derivative Liability, Fair Value, Gross Liability (6,100,000)    
Business Combination, Contingent Consideration, Liability (17,600,000)    
Financial and Nonfinancial Liabilities, Fair Value Disclosure (23,700,000)    
Level 1 [Member] | Fair Value, Recurring [Member]      
Financial instruments measured at fair value, on a recurring basis      
Trading securities 8,200,000    
Available-for-sale Securities, Noncurrent 0    
Assets, Fair Value Disclosure 8,200,000    
Derivative Liability, Fair Value, Gross Liability 0    
Business Combination, Contingent Consideration, Liability 0    
Financial and Nonfinancial Liabilities, Fair Value Disclosure 0    
Level 2 [Member] | Fair Value, Recurring [Member]      
Financial instruments measured at fair value, on a recurring basis      
Trading securities 4,200,000    
Available-for-sale Securities, Noncurrent 3,300,000    
Assets, Fair Value Disclosure 7,500,000    
Derivative Liability, Fair Value, Gross Liability (6,100,000)    
Business Combination, Contingent Consideration, Liability 0    
Financial and Nonfinancial Liabilities, Fair Value Disclosure (6,100,000)    
Level 3 [Member] | Fair Value, Recurring [Member]      
Financial instruments measured at fair value, on a recurring basis      
Trading securities 0    
Available-for-sale Securities, Noncurrent 0    
Assets, Fair Value Disclosure 0    
Derivative Liability, Fair Value, Gross Liability 0    
Business Combination, Contingent Consideration, Liability (17,600,000)    
Financial and Nonfinancial Liabilities, Fair Value Disclosure $ (17,600,000)    
Maximum [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Maturities, Date Dec. 31, 2033    
Minimum [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale Securities, Debt Maturities, Date Jan. 01, 2027