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Subsequent Event	9 Months Ended
Subsequent Event	Sep. 30, 2016
Subsequent Events [Abstract]
Subsequent Event	11. Subsequent event In October 2016, we announced an increase in our quarterly cash dividend rate from $0.38 to $0.50 per share. This dividend will be payable November 21, 2016, to shareholders of record on November 7, 2016.