Stock-Based Compensation Plans (Schedule of Stock Option Activity) (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares
Number of Shares [Abstract]
Options, Outstanding, Number, Beginning | shares	3,739,910
Options, Forfeitures | shares	(732,801)
Options, Outstanding, Number, Ending | shares	3,007,109
Options, Exercisable, Number | shares	2,920,219
Weighted-Average Price Per Share [Abstract]
Options, Outstanding, Weighted Average Exercise Price, Beginning | $ / shares	$ 5.56
Options, Forfeitures, Weighted Average Exercise Price | $ / shares	4.33
Options, Outstanding, Weighted Average Exercise Price, Ending | $ / shares	5.86
Options, Exercisable, Weighted Average Exercise Price | $ / shares	$ 5.85
Weighted-Average Remaining Contract Life [Abstract]
Options, Outstanding, Weighted Average Remaining Contractual Term	3 years 9 months 20 days
Options, Exercisable, Weighted Average Remaining Contractual Term	3 years 8 months 12 days
Aggregate Intrinsic Value [Abstract]
Options, Outstanding, Intrinsic Value | $	$ 0
Options, Exercisable, Intrinsic Value | $	$ 0