RECONCILIATION OF OPERATING INCOME TO NON-GAAP OPERATING INCOME
(Unaudited, in thousands) | ||||||||||||||||
Three Months Ended June 30, | Six Months Ended June 30, | |||||||||||||||
2019 | 2018 | 2019 | 2018 | |||||||||||||
Total operating income | $ | 20,119 | $ | 24,882 | $ | 41,836 | $ | 46,918 | ||||||||
Adjustments to reconcile total operating income to non-GAAP total operating income: | ||||||||||||||||
Stock-based compensation expense | 22,709 | 15,892 | 38,719 | 30,921 | ||||||||||||
Amortization of acquisition-related intangible assets | 51 | 197 | 102 | 447 | ||||||||||||
Deferred compensation plan expense | 772 | 410 | 2,571 | 273 | ||||||||||||
Non-GAAP operating income | $ | 43,651 | $ | 41,381 | $ | 83,228 | $ | 78,559 | ||||||||