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Derivatives and Risk Management (Derivative Notional Amounts) (Details) - Derivatives Designated as Hedging Instruments - Cash Flow Hedging - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Derivative [Line Items]    
Notional amount $ 134,707 $ 121,608
After-tax, net unrealized losses on derivatives arising during period (1,264)  
Net amount expected to be reclassified to earnings in the next 12 months (1,075)  
Foreign Exchange Contract    
Derivative [Line Items]    
After-tax, net unrealized losses on derivatives arising during period (1,011)  
Net amount expected to be reclassified to earnings in the next 12 months (1,011)  
Foreign Exchange Contract | United Kingdom, Pounds    
Derivative [Line Items]    
Notional amount 11,655 16,847
Foreign Exchange Contract | Japan, Yen    
Derivative [Line Items]    
Notional amount 22,122 32,302
Foreign Exchange Contract | Canada, Dollars    
Derivative [Line Items]    
Notional amount 15,779 16,494
Foreign Exchange Contract | Euro Member Countries, Euro    
Derivative [Line Items]    
Notional amount 38,581 0
Interest Rate Swap Contracts    
Derivative [Line Items]    
Notional amount 46,570 $ 55,965
After-tax, net unrealized losses on derivatives arising during period (253)  
Net amount expected to be reclassified to earnings in the next 12 months $ (64)