Stockholders' Equity and Stock Awards - Stock Options Outstanding (Details)	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number or Shares, Outstanding at Beginning Balance (in shares) | shares	4,150,112
Number of Shares, Granted (in shares) | shares	716,355
Number of Shares, Exercised (in shares) | shares	(788,868)
Number of Shares, Expired or forfeited (in shares) | shares	(61,152)
Number of Shares, Outstanding at Ending Balance (in shares) | shares	4,016,447
Number of Shares, Exercisable at Ending Balance (in shares) | shares	2,274,524
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted Average Exercise Price, Outstanding at Beginning Balance (in dollars per share) | $ / shares	$ 20.48
Weighted Average Exercise Price, Granted (in dollars per share) | $ / shares	26.69
Weighted Average Exercise Price, Exercised (in dollars per share) | $ / shares	20.24
Weighted Average Exercise Price, Expired or forfeited (in dollars per share) | $ / shares	23.99
Weighted Average Exercise Price, Outstanding at Ending Balance (in dollars per share) | $ / shares	21.57
Weighted Average Exercise Price, Exercisable at Ending Balance (in dollars per share) | $ / shares	$ 19.86
Weighted - Average Remaining Contractual Term, Outstanding at Ending Balance	6 years 8 months 8 days
Weighted - Average Remaining Contractual Term, Exercisable at Ending Balance	5 years 7 months 24 days