Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Consolidated Income Statements (Parenthetical)

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Consolidated Income Statements (Parenthetical) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Consolidated Income Statements [Abstract]      
Share based compensation expenses, before tax $ 6,159,000 $ 2,875,000 $ 2,986,000
Share based compensation expenses, net of tax $ 5,400,000 $ 2,500,000 $ 2,600,000