Shareholders' Equity, Stock Plans and Preferred Stock (Schedule of Preferred Stock) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at the beginning of the period	$ 4,918	$ 4,918	$ 4,918
Redemption of preferred stock	(4,918)	0	0
Balance at the end of the period	$ 0	$ 4,918	$ 4,918