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Earnings (Loss) Per Common Share (Tables)
 9 Months Ended
Sep. 30, 2014
Earnings Per Share [Abstract]  
Computation of basic and diluted loss per share
The following table sets forth the computation of basic and diluted earnings (loss) per share (amounts in thousands, except per share amounts): 
 
Quarter Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2013
 
2014
 
2013
 
2014
Numerator:
 
 
 
 
 
 
 
Net (loss) income attributable to Alliance HealthCare Services, Inc.
$
(2,070
)
 
$
4,011

 
$
(17,452
)
 
$
8,727

Denominator:
 
 
 
 
 
 
 
Weighted-average shares-basic
10,639

 
10,710

 
10,632

 
10,683

Effect of dilutive securities:
 
 
 
 
 
 
 
Employee stock options
—

 
141

 
—

 
181

Weighted-average shares-diluted
10,639

 
10,851

 
10,632

 
10,864

(Loss) income per common share attributable to Alliance HealthCare Services, Inc.:
 
 
 
 
 
 
 
Basic
$
(0.19
)
 
$
0.37

 
$
(1.64
)
 
$
0.82

Diluted
$
(0.19
)
 
$
0.37

 
$
(1.64
)
 
$
0.80

Stock options excluded from the computation of diluted per share amounts:
 
 
 
 
 
 
 
Weighted-average shares for which the exercise price exceeds average market price of common stock
201

 
338

 
155

 
234

Average exercise price per share that exceeds average market price of common stock
$
38.34

 
$
34.74

 
$
35.32

 
$
37.70