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Subsequent Event - Dividend Payable (Details) - $ / shares
12 Months Ended
Jan. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Subsequent Event [Line Items]        
Common stock dividends declared (usd per share)   $ 0.20 $ 0.20 $ 0.20
Subsequent Event [Member]        
Subsequent Event [Line Items]        
Common stock dividends declared (usd per share) $ 0.05