Warrants (Summary of Warrant Activity) (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Warrants Summary Of Warrant Activity Details
Warrants, Outstanding as of beginning of period	1,973	3,761
Granted with exercise price less than intrinsic value	0	0
Granted with exercise price greater than intrinsic value	0	0
Exercised	0	(460)
Canceled/expired	0	(1,328)
Warrants, Outstanding as of end of period	1,973	1,973
Warrants, Weighted-Average Exercise Prices, Outstanding as of beginnig of period		$ 2.23
Warrants, Weighted-Average Exercise Prices, Granted less than intrinsic value	$ 0	0
Warrants, Weighted-Average Exercise Prices, Granted greater than intrinsic value	0	0
Warrants, Weighted-Average Exercise Prices, Exercised	0	1.97
Warrants, Weighted-Average Exercise Prices, cancelled or expired	0	$ 1.97
Warrants, Weighted-Average Exercise Prices, Outstanding as of end of period	$ 2.47
Warrants, Exercisable at end of period	1,973
Warrants, Weighted-Average Exercise Price, Exercisable	$ 2.47