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Certain Balance Sheet Components Capitalized Interest Narrative (Details) (USD $)
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3 Months Ended | ||
|---|---|---|---|
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Mar. 31, 2013
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Mar. 31, 2012
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Dec. 31, 2012
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| Property, Plant and Equipment [Line Items] | |||
| Construction in progress, including purchased equipment | $ 30,108,000 | $ 26,097,000 | |
| Interest Costs Capitalized | 43,000 | 0 | |
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Enterprise Resource Planning Software System [Member]
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| Property, Plant and Equipment [Line Items] | |||
| Construction in progress, including purchased equipment | 12,300,000 | ||
| Interest Costs Capitalized | $ 43,000 | ||