Share-Based Compensation Plans (Stock Options) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares
Number of Shares
Number of Shares Outstanding beginning balance | shares	4,743
Number of Shares Granted | shares	3,100
Number of Shares Exercised | shares	(1,442)
Number of Shares Forfeited or expired | shares	(556)
Number of Shares Outstanding ending balance | shares	5,845
Number of Shares Fully vested and expected to vest | shares	5,718
Number of Shares Exercisable | shares	2,140
Weighted-Average Exercise Price per Share
Weighted Average Exercise Price Per Share Outstanding beginning balance (in dollars per share) | $ / shares	$ 8.79
Weighted Average Exercise Price Per Share Granted (in dollars per share) | $ / shares	9.10
Weighted Average Exercise Price Per Share Exercised (in dollars per share) | $ / shares	7.91
Weighted Average Exercise Price Per Share Forfeited or expired (in dollars per share) | $ / shares	9.39
Weighted Average Exercise Price Per Share Outstanding ending balance (in dollars per share) | $ / shares	9.11
Weighted Average Exercise Price Per Share Fully vested and expected to vest (in dollars per share) | $ / shares	9.11
Weighted Average Exercise Price Per Share Exercisable (in dollars per share) | $ / shares	$ 8.87
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted Average Remaining Contractual Term Outstanding (years)	7 years 8 months 26 days
Average Remaining Contractual Term Fully vested and expected to vest (years)	7 years 8 months 15 days
Average Remaining Contractual Term Exercisable (years)	6 years 14 days
Aggregate intrinsic value Outstanding ending balance (in dollars) | $	$ 22,738
Aggregate intrinsic value Fully vested and expected to vest (in dollars) | $	22,256
Aggregate intrinsic value Exercisable (in dollars) | $	$ 8,829