(Unaudited, in thousands)
Three Months Ended June 30, | Six Months Ended June 30, | |||||||||||||||
2021 | 2020 | 2021 | 2020 | |||||||||||||
Total income before income taxes | $ | 63,659 | $ | 33,155 | $ | 112,332 | $ | 62,427 | ||||||||
Adjustments to reconcile income before income taxes to non-GAAP income before income taxes: | ||||||||||||||||
Stock-based compensation expense | 32,126 | 21,044 | 60,710 | 39,606 | ||||||||||||
Deferred compensation plan expense | 290 | 460 | 233 | 554 | ||||||||||||
Non-GAAP income before income taxes | $ | 96,075 | $ | 54,659 | $ | 173,275 | $ | 102,587 |