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Subsequent events	6 Months Ended
Subsequent events	Jun. 30, 2011
Subsequent events [Abstract]
Subsequent events	13. Subsequent events On July 28, 2011, the Board of Directors declared a quarterly cash dividend of $0.28 per share of common stock. This dividend will be paid on September 8, 2011 to all stockholders of record as of the close of business on August 18, 2011.