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, 2019	Dec. 31, 2018
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	$ 1.38	$ 3.85
Aggregate vested restricted stock units awards, fair value	$ 498	$ 424
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
Aggregate vested restricted stock units awards, fair value	$ 0	$ 1,547