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Derivatives (Details 1)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2012
USD ($)
Bank
Apr. 28, 2017
USD ($)
Bank
Derivative [Line Items]            
Maximum remaining maturity of foreign currency derivatives     2 years      
Net cash payments from settlement     $ (3,598) $ (17,773)    
Foreign Exchange Contract [Member]            
Derivative [Line Items]            
Net cash payments from settlement     3,291 14,962    
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]            
Derivative [Line Items]            
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net $ 1,075 $ 335 1,886 (124)    
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Contract [Member]            
Derivative [Line Items]            
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net 378 97 2,064 (167)    
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign Exchange Contract [Member]            
Derivative [Line Items]            
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net 697 238 (178) 43    
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]            
Derivative [Line Items]            
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 1,380 $ (2,545) $ (6,218) $ (12,949)    
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]            
Derivative [Line Items]            
Term of interest rate derivatives         5 years  
Number of banks transacted with for interest rate swap agreements (in banks) | Bank         3 1
Fixed interest rate         1.03% 1.92%
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | one-month LIBOR [Member]            
Derivative [Line Items]            
Derivative amount of hedge         $ 100,000 $ 100,000