Stock-Based Compensation (Schedule of Share-based Compensation, Stock Options, Activity) (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
Options
Options outstanding at beginning of period	111,571	139,446	139,446
Granted	0	5,507
Canceled / forfeited	(336)	(3,010)
Expired	(4,569)	(10,806)
Options outstanding at end of period	106,666	131,137	111,571	139,446
Options exercisable at end of period	88,172	92,781
Weighted- average exercise price
Options outstanding at beginning of period	$ 38.92	$ 53.66	$ 53.66
Granted		$ 6.80
Canceled / forfeited	$ 77.04	$ 47.20
Expired	$ 129.60	$ 90.72
Options outstanding at end of period	$ 34.91	$ 48.50	$ 38.92	$ 53.66
Options exercisable at end of period	$ 40.99	$ 66.45
Weighted-average remaining contractual term (years), Options outstanding	6 years 2 months 21 days	6 years 7 months 12 days	6 years 2 months 12 days	6 years 2 months 12 days
Weighted-average remaining contractual term (years), Option Granted		10 years 0 months 0 days
Weighted-average remaining contractual term (years), Options exercisable	5 years 8 months 15 days	5 years 6 months 0 days
Aggregate intrinsic value outstanding at beginning of year	$ 0	$ 79,400	$ 79,400
Aggregate intrinsic value Granted		0
Aggregate intrinsic value outstanding at end of year	600	88,200	0	79,400
Aggregate intrinsic value exercisable	$ 0	$ 56,800