Equity Transactions and Stock-Based Compensation Plans (Schedule of Restricted Stock Unit Activity) (Details) - Restricted Stock Units (RSUs) [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Time-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Units, Weighted Average Grant Date Fair Value per unit, Granted	$ 3.85	$ 5.61	$ 1.47
Aggregate vested restricted stock units awards, fair value	$ 424	$ 1,206	$ 314
Performance-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Units, Weighted Average Grant Date Fair Value per unit, Granted	$ 0.00	$ 7.75	$ 0.00
Aggregate vested restricted stock units awards, fair value	$ 1,547	$ 969	$ 609