Shareholders' Equity, Stock Plans and Preferred Stock (Schedule of Preferred Stock) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at the beginning of the period	$ 0	$ 4,918	$ 4,918
Redemption of preferred stock	0	(4,918)	0
Balance at the end of the period	$ 0	$ 0	$ 4,918