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Net Income Per Share (Tables)
 3 Months Ended
Mar. 31, 2017
Earnings Per Share [Abstract]  
Schedule of Net Income Per Share
 
Three Months Ended 
 March 31,
 
2017
 
2016
 
 
 
 
Net income (loss) allocable to common stockholders (in millions)
$
6.6

 
$
(14.6
)
 
 
 
 
Shares in thousands:
 
 
 
Average common shares outstanding - basic
9,063

 
9,063

Potentially dilutive shares related to stock options
111

 
—

Average common shares outstanding - diluted
9,174

 
9,063

 
 
 
 
Net income (loss) per common share:
 
 
 
    – Basic
$
0.73

 
$
(1.60
)
    – Diluted
$
0.72

 
$
(1.60
)
 
 
 
 
Options outstanding and considered anti-dilutive as their exercise price exceeded the average share market price (in thousands)
—

 
475