Equity Transactions and Stock-Based Compensation Plans (Schedule of Stock Option Activity) (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares
Number of Shares [Abstract]
Options, Outstanding, Number, Beginning | shares	4,269,910
Options, Forfeitures | shares	(527,000)
Options Exercised, Shares | shares	(3,000)
Options, Outstanding, Number, Ending | shares	3,739,910
Options, Exercisable, Number | shares	3,259,125
Weighted-Average Price Per Share [Abstract]
Options, Outstanding, Weighted Average Exercise Price, Beginning | $ / shares	$ 6.78
Options, Forfeitures, Weighted Average Exercise Price | $ / shares	15.43
Options, Exercises in Period, Weighted Average Exercise Price | $ / shares	3.84
Options, Outstanding, Weighted Average Exercise Price, Ending | $ / shares	5.56
Options, Exercisable, Weighted Average Exercise Price | $ / shares	$ 5.91
Weighted-Average Remaining Contract Life [Abstract]
Options, Outstanding, Weighted Average Remaining Contractual Term	4 years
Options, Exercisable, Weighted Average Remaining Contractual Term	3 years 6 months
Aggregate Intrinsic Value [Abstract]
Options, Outstanding, Intrinsic Value | $	$ 0
Options, Exercisable, Intrinsic Value | $	$ 0