Stock-based Compensation (Schedule of Share-based Compensation, Stock Options, Activity) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Options (in shares)
Balance at beginning of year	85,901	111,571	139,446
Granted	3,300,000	0	5,507
Exercised/Released	0	0	(5,250)
Cancelled / forfeited	(8,301)	(20,482)	(17,326)
Expired	(1,691)	(5,188)	(10,806)
Balance at end of year	3,375,909	85,901	111,571
Exercisable at end of year	75,909	67,407	73,665
Weighted-average exercise price (in dollars per share)
Balance at beginning of year	$ 34.85	$ 38.92	$ 53.66
Granted	4.79	0.00	6.80
Exercised/Released	0.00	0.00	5.70
Cancelled / forfeited	21.14	33.90	124.87
Expired	151.20	125.83	90.72
Balance at end of year	$ 5.44	$ 34.85	$ 38.92