Quarterly Financial Information (Unaudited) (Narrative) (Details) (USD $)	3 Months Ended	12 Months Ended			3 Months Ended
	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Patent Infringement
Effect of Fourth Quarter Events [Line Items]
Charge relating to various litigation matters	$ 2,400,000				$ 1,800,000
Goodwill impairment	656,000	0	656,000	1,898,000
Reversal of environmental reserve	$ 1,200,000