Annual report pursuant to Section 13 and 15(d)

Commitments And Contingencies (Narrative) (Details)

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Commitments And Contingencies (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2011
years
Loss Contingencies [Line Items]  
Letters of credit, outstanding amount 2,029,000
Minimum [Member]
 
Loss Contingencies [Line Items]  
Base lease term, years 5
Maximum [Member]
 
Loss Contingencies [Line Items]  
Base lease term, years 10
Inventories [Member]
 
Loss Contingencies [Line Items]  
Outstanding inventory purchase obligations 351,854,000