Stock-based Compensation (Schedule of Share-based Compensation, Stock Options, Activity) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Options (in shares)
Balance at beginning of year	3,375,909	85,901	111,571
Granted	14,222		0
Exercised/Released	(2,266)	0	0
Cancelled / forfeited	(2,196)	(8,301)	(20,482)
Expired	(1,697)	(1,691)	(5,188)
Balance at end of year	3,383,972	3,375,909	85,901
Exercisable at end of year	83,972	75,909	67,404
Weighted-average exercise price (in dollars per share)
Balance at beginning of year	$ 5.44	$ 34.85	$ 38.92
Granted	3.71	4.79	0.00
Exercised/Released	3.60	0.00	0.00
Cancelled / forfeited	30.56	21.14	33.90
Expired	209.87	151.20	125.83
Balance at end of year	$ 5.32	$ 5.44	$ 34.85