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Net Income Per Share (Tables)
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Schedule of Net Income Per Share
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2017
 
2016
 
2017
 
2016
Net loss allocable to common stockholders (in millions)
$
(24.4
)
 
$
(2.9
)
 
$
(17.8
)
 
$
(17.5
)
 
 
 
 
 
 
 
 
Shares in thousands:
 
 
 
 
 
 
 
Average common shares outstanding - basic
9,077

 
9,080

 
9,070

 
9,071

Potentially dilutive shares related to stock options (a)
—

 
—

 
—

 
—

Average common shares outstanding - diluted
9,077

 
9,080

 
9,070

 
9,071

 
 
 
 
 
 
 
 
Net loss per common share – basic and diluted
(2.69
)
 
$
(0.32
)
 
$
(1.96
)
 
$
(1.92
)
 
 
 
 
 
 
 
 
(a) Common stock equivalents excluded from the diluted calculation as a result of a net loss in the period (in thousands)
56

 
14

 
84

 
7

 
 
 
 
 
 
 
 
Options outstanding and considered anti-dilutive as their exercise price exceeded the average share market price (in thousands)
30

 
375

 
30

 
490