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Net Income Per Share (Schedule of Income Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income Per Share Calculation [Line Items]    
Net income (loss) allocable to common stockholders $ 6.6 $ (14.6)
Weighted average number of shares outstanding, basic 9,063 9,063
Potentially dilutive shares 111  
Weighted average number of shares outstanding, diluted 9,174 9,063
Net income (loss) per common share - basic $ 0.73 $ (1.60)
Net income (loss) per common share - diluted $ 0.72 $ (1.60)
Antidilutive securities excluded from computation of earnings per share   475