Certain Balance Sheet Components Capitalized Interest Narrative (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Construction in progress, including purchased equipment	$ 33,529,000		$ 33,529,000		$ 26,097,000
Capitalized interest	21,000	0	64,000	0
Enterprise Resource Planning Software System [Member]
Property, Plant and Equipment [Line Items]
Construction in progress, including purchased equipment	11,100,000		11,100,000
Capitalized interest	$ 21,000		$ 64,000