Share-Based Compensation Plans (Stock Options) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) $ / shares shares
Number of Shares
Number of shares outstanding beginning balance | shares	5,845
Number of shares granted | shares	805
Number of shares exercised | shares	(1,882)
Number of shares forfeited or expired | shares	(402)
Number of shares outstanding ending balance | shares	4,366
Number of shares fully vested and expected to vest | shares	4,245
Number of Shares Exercisable | shares	2,197
Weighted-Average Exercise Price per Share
Weighted Average Exercise Price Per Share Outstanding beginning balance (in dollars per share) | $ / shares	$ 9.11
Weighted Average Exercise Price Per Share Granted (in dollars per share) | $ / shares	12.85
Weighted Average Exercise Price Per Share Exercised (in dollars per share) | $ / shares	9.26
Weighted Average Exercise Price Per Share Forfeited or expired (in dollars per share) | $ / shares	9.56
Weighted Average Exercise Price Per Share Outstanding ending balance (in dollars per share) | $ / shares	9.70
Weighted Average Exercise Price Per Share Fully vested and expected to vest (in dollars per share) | $ / shares	9.66
Weighted Average Exercise Price Per Share Exercisable (in dollars per share) | $ / shares	$ 8.92
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted Average Remaining Contractual Term Outstanding (years)	7 years 5 months 19 days
Average Remaining Contractual Term Fully vested and expected to vest (years)	7 years 5 months 4 days
Average Remaining Contractual Term Exercisable (years)	6 years 4 months 28 days
Aggregate intrinsic value Outstanding ending balance (in dollars) | $	$ 23,391
Aggregate intrinsic value Fully vested and expected to vest (in dollars) | $	22,877
Aggregate intrinsic value Exercisable (in dollars) | $	$ 13,407