Quarterly report pursuant to Section 13 or 15(d)

Comprehensive Income (Details)

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Comprehensive Income (Details) (USD $)
In Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Comprehensive Income [Abstract]        
Comprehensive income $ 12,912 $ 8,888 $ 32,750 $ 20,219