Inventory Narrative (Details) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Inventories [Abstract]
Inventory write-down charges	$ 3,400,000	$ 3,419,000	$ 0	$ 0
Charitable contributions		600,000	1,700,000	2,000,000
Gain on charitable contributions		100,000	600,000	700,000
Net reduction of inventory after charitable contributions	$ 500,000	$ 500,000	$ 1,100,000	$ 1,300,000