Stock-Based Compensation - RSU Activity (Details) - 2012 Plan - RSUs shares in Thousands	6 Months Ended
	Jun. 30, 2020 $ / shares shares
Number of shares outstanding
Balance at the beginning of the period ( in shares) | shares	1,437
Granted (in shares) | shares	535
Vested/Released (in shares) | shares	(338)
Forfeited (in shares) | shares	(20)
Balance at the end of the period ( in shares) | shares	1,614
Weighted Average Grant Date Fair Value
Balance at the beginning of the period (in dollars per share) | $ / shares	$ 22.64
Grant date fair value (in dollars per share) | $ / shares	21.91
Vested/Released (in dollars per share) | $ / shares	27.06
Forfeited (in dollars per share) | $ / shares	22.61
Balance at the end of the period (in dollars per share) | $ / shares	$ 21.47