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Fair Value Measurement Narrative (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Nov. 30, 2010
USD ($)
May. 31, 2008
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
forward_exchange_contrtact
investment
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available for sale investments       $ 52,000,000 $ 43,000,000  
Payments to acquire available-for-sale securities     $ 5,000,000 24,500,000 17,600,000 $ 11,100,000
Trading securities       9,700,000 8,900,000  
Purchase of trading securities held-for-investment       1,000,000 1,200,000  
Proceeds from the sale of trading securities held-for-investment       $ 300,000 200,000  
Number of foreign exchange contracts held (foreign_exchange_contract) | forward_exchange_contrtact       42    
Gain (loss) on forward interest rate lock, recorded in accumulated other comprehensive loss       $ (400,000) (400,000)  
Hedge ineffectiveness with respect to forward exchange cash flow hedges       0 0 $ 0
Long-term Debt       595,900,000 594,900,000  
Long-term debt, fair value       630,500,000 645,100,000  
Interest Rate Lock 2010            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Gain (loss) on forward interest rate lock, recorded in accumulated other comprehensive loss $ (1,600,000)          
Interest Rate Lock 2008            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Gain (loss) on forward interest rate lock, recorded in accumulated other comprehensive loss   $ 1,200,000        
Minimum            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative, notional amount       500,000.0    
Maximum            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative, notional amount       2,500,000.0    
Quoted Prices in Active Markets for Similar Assets (Level 2)            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available for sale investments       47,400,000 43,000,000  
Trading securities       0 0  
Unobservable inputs for which little or no market data exists (Level 3)            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available for sale investments       4,600,000 0  
Payments to acquire available-for-sale securities     $ 5,000,000      
Trading securities       $ 0 $ 0  
Number of available-for-sale securities (investment) | investment       1