Warrants (Summary of Warrant Activity) (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Warrants Summary Of Warrant Activity Details
Warrants, Outstanding as of beginning of period	5,039	6,526	8,091
Granted with exercise price less than intrinsic value	0	0	0
Granted with exercise price greater than intrinsic value	0	0	2,148
Exercised	0	(1,487)	(3,713)
Canceled/expired	(1,278)	0	0
Warrants, Outstanding as of end of period	3,761	5,039	6,526
Warrants, Weighted-Average Exercise Prices, Outstanding as of beginnig of period	$ 3.34	$ 3.08
Warrants, Weighted-Average Exercise Prices, Granted less than intrinsic value	0	0	$ 0
Warrants, Weighted-Average Exercise Prices, Granted greater than intrinsic value	0	0	2.47
Warrants, Weighted-Average Exercise Prices, Exercised	0	2.19	2.67
Warrants, Weighted-Average Exercise Prices, cancelled or expired	6.24	0	0
Warrants, Weighted-Average Exercise Prices, Outstanding as of end of period	$ 2.23	$ 3.34	$ 3.08
Warrants, Exercisable at end of period	3,761
Warrants, Weighted-Average Exercise Price, Exercisable	$ 2.23