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Net Income Per Share (Tables)
 9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Schedule of Net Income Per Share
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2017
 
2016
 
2017
 
2016
Net loss allocable to common stockholders (in millions)
$
(10.5
)
 
$
(41.3
)
 
$
(28.3
)
 
$
(58.8
)
 
 
 
 
 
 
 
 
Shares in thousands:
 
 
 
 
 
 
 
Average common shares outstanding - basic
9,103

 
9,096

 
9,081

 
9,102

Potentially dilutive shares related to stock options (a)
—

 
—

 
—

 
—

Average common shares outstanding - diluted
9,103

 
9,096

 
9,081

 
9,102

 
 
 
 
 
 
 
 
Net loss per common share – basic and diluted
$
(1.15
)
 
$
(4.54
)
 
$
(3.12
)
 
$
(6.46
)
 
 
 
 
 
 
 
 
(a) Common stock equivalents excluded from the diluted calculation as a result of a net loss in the period (in thousands)
13

 
14

 
60

 
7

 
 
 
 
 
 
 
 
Options outstanding and considered anti-dilutive as their exercise price exceeded the average share market price (in thousands)
327

 
375

 
30

 
490