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Consolidated Income Statements (Unaudited) (Parenthetical) (USD $)
In Thousands
3 Months Ended6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Costs and expenses:    
Selling and promotional expenses to related parties$ 2$ 2,628$ 403$ 4,975