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Derivatives - Schedule of Unsettled Purchased Foreign Currency Forward Contracts (Details) - Long - Foreign currency forward contracts
₨ in Thousands, £ in Thousands, zł in Thousands, kr in Thousands, R$ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands
Jun. 30, 2018
SGD ($)
Jun. 30, 2018
AUD ($)
Jun. 30, 2018
INR (₨)
Jun. 30, 2018
USD ($)
Jun. 30, 2018
GBP (£)
Jun. 30, 2018
SEK (kr)
Jun. 30, 2018
PLN (zł)
Jun. 30, 2018
BRL (R$)
Dec. 31, 2017
SGD ($)
Dec. 31, 2017
AUD ($)
Dec. 31, 2017
INR (₨)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
GBP (£)
Dec. 31, 2017
SEK (kr)
Dec. 31, 2017
PLN (zł)
Dec. 31, 2017
BRL (R$)
Polish Zloty                                
Derivative [Line Items]                                
Notional Amount       $ 60,630     zł 216,000         $ 61,016     zł 225,000  
Average contract rate 0.2807 0.2807 0.2807 0.2807 0.2807 0.2807 0.2807 0.2807 0.2712 0.2712 0.2712 0.2712 0.2712 0.2712 0.2712 0.2712
Singapore Dollar                                
Derivative [Line Items]                                
Notional Amount $ 54,900     $ 41,243         $ 70,750     $ 52,065        
Average contract rate 0.7512 0.7512 0.7512 0.7512 0.7512 0.7512 0.7512 0.7512 0.7359 0.7359 0.7359 0.7359 0.7359 0.7359 0.7359 0.7359
British Pound Sterling                                
Derivative [Line Items]                                
Notional Amount       $ 29,584 £ 21,500             $ 34,307 £ 25,900      
Average contract rate 1.3760 1.3760 1.3760 1.3760 1.3760 1.3760 1.3760 1.3760 1.3246 1.3246 1.3246 1.3246 1.3246 1.3246 1.3246 1.3246
Indian Rupee                                
Derivative [Line Items]                                
Notional Amount     ₨ 1,705,000 $ 25,160             ₨ 1,720,000 $ 25,939        
Average contract rate 0.0148 0.0148 0.0148 0.0148 0.0148 0.0148 0.0148 0.0148 0.0151 0.0151 0.0151 0.0151 0.0151 0.0151 0.0151 0.0151
Australian Dollar                                
Derivative [Line Items]                                
Notional Amount   $ 26,400   $ 20,178           $ 20,750   $ 15,932        
Average contract rate 0.7643 0.7643 0.7643 0.7643 0.7643 0.7643 0.7643 0.7643 0.7678 0.7678 0.7678 0.7678 0.7678 0.7678 0.7678 0.7678
Swedish Krona                                
Derivative [Line Items]                                
Notional Amount       $ 6,411   kr 52,900           $ 5,353   kr 44,100    
Average contract rate 0.1212 0.1212 0.1212 0.1212 0.1212 0.1212 0.1212 0.1212 0.1214 0.1214 0.1214 0.1214 0.1214 0.1214 0.1214 0.1214
Brazilian Real                                
Derivative [Line Items]                                
Notional Amount       $ 5,568       R$ 19,250       $ 4,976       R$ 16,800
Average contract rate 0.2892 0.2892 0.2892 0.2892 0.2892 0.2892 0.2892 0.2892 0.2962 0.2962 0.2962 0.2962 0.2962 0.2962 0.2962 0.2962