Share-Based Payment Arrangements (Summary of Option Activity) (Details) - Options [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Outstanding at Beginning	46,865,000
Number of Shares, Exercised/Released	0
Number of Shares, Outstanding at Ending	46,865,000	46,865,000
Number of Shares, Exercisable at Ending	46,865,000
Weighted Average Exercise Price, Outstanding at Beginning	$ 31.88
Weighted Average Exercise Price, Outstanding at Ending	31.88	$ 31.88
Weighted Average Exercise Price, Exercisable at Ending	$ 31.88
Weighted Average Remaining Contractual Term (Years)	2 years 3 months 18 days	2 years 7 months 6 days
Weighted Average Remaining Contractual Term (Years), Exercisable at Ending	2 years 3 months 18 days
Aggregate Intrinsic Value, Outstanding at Beginning	$ 164
Aggregate Intrinsic Value, Outstanding at Ending	399	$ 164
Aggregate Intrinsic Value, Exercisable at Ending	$ 399