Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Net income (loss) $ 21,198 $ (3,991)
Other comprehensive income (loss), net of tax:    
Foreign currency translation adjustments 183 (1,203)
Unrealized gains/losses on investments:    
Unrealized holding gains (losses) arising during the period 89 (7)
Net losses reclassified into earnings (3) (1)
Net unrealized gains (losses) on investments 86 (8)
Unrealized gains/losses on hedging securities:    
Unrealized hedge gains (losses) arising during the period 6,298 (421)
Net unrealized gains/losses on hedging securities 3,740 245
Other comprehensive income (loss) 4,009 (966)
Comprehensive income (loss) 25,207 (4,957)
Product revenues    
Unrealized gains/losses on hedging securities:    
Net (gains) losses reclassified into earnings for revenue / expense hedges (6,636) 2,865
Operating Expenses    
Unrealized gains/losses on hedging securities:    
Net (gains) losses reclassified into earnings for revenue / expense hedges $ 4,078 $ (2,199)