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Equity (Stock Repurchase Program) (Details)
$ / shares in Units, shares in Millions
 3 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
shares
Equity [Abstract]  
Treasury stock, shares, acquired (in shares) | shares 0.8
Treasury stock value acquired including acquisition costs $ 8,300,000
Treasury stock acquired, average cost per share (in dollars per share) | $ / shares $ 10.22
Available repurchase of common stock, authorized amount (up to) $ 41,710,000