Segment Information (Narrative) (Details)	12 Months Ended
	Dec. 31, 2011
Segment Reporting Information [Line Items]
Number of customer accounts for 10% or more of consolidated trade sales	0
Major customer revenue percentage on consolidated trade sales, maximum	10.00%
Retail [Member]
Segment Reporting Information [Line Items]
Percentage of ownership in joint venture	51.00%