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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, 2015
Dec. 31, 2014
Dec. 31, 2013
Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains reclassified from AOCI into income (effective portion) $ 424 $ 0 $ 0
Cost of revenue [Member] | Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains reclassified from AOCI into income (effective portion) 59
Operating expense [Member] | Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains reclassified from AOCI into income (effective portion) 365
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 (87)   $ 0
Gains recognized in income on derivatives (amount excluded from effective 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 344 (72) 596
Other Comprehensive Income (Loss) [Member] | Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
(Losses) in AOCI on derivatives (effective portion) $ (133)   $ 0
Gains in AOCI on derivatives (effective portion)   $ 311