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Derivative and Hedging Activities Derivative and Hedging Activities - Gain Loss in Statement of Operations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains reclassified from AOCI into income (effective portion)   $ 424 $ 0
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion $ (44)    
Cost of revenue [Member] | Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains reclassified from AOCI into income (effective portion)   59 0
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion (6)    
Operating expense [Member] | Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains reclassified from AOCI into income (effective portion)   365 0
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion (38)    
Other Nonoperating Income (Expense) [Member] | Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
(Losses) Recognized in Income on Derivatives (Amount Excluded from Effectiveness Testing (63) (87)  
Derivative Instruments, Gain Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing     18
Other Nonoperating Income (Expense) [Member] | Not Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (loss) recorded in other expense, net 343 344 (72)
Other Comprehensive Income (Loss) [Member] | Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments, Gain Recognized in Other Comprehensive Income (Loss), Effective Portion $ 202   $ 311
(Losses) in AOCI on derivatives (effective portion)   $ (133)