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Loss Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2013
Earnings Per Share [Abstract]  
Computation of basic and diluted loss per share
The following table sets forth the computation of basic and diluted loss per share (amounts in thousands, except per share amounts):
 
 
Quarter Ended
June 30,
 
Six Months Ended
June 30,
 
2012
 
2013
 
2012
 
2013
Numerator:
 
 
 
 
 
 
 
Net loss attributable to Alliance HealthCare Services, Inc.
$
(801
)
 
$
(12,964
)
 
$
(5,623
)
 
$
(15,382
)
Denominator:
 
 
 
 
 
 
 
Weighted-average shares-basic
10,633

 
10,629

 
10,648

 
10,629

Effect of dilutive securities:
 
 
 
 
 
 
 
Employee stock options
—

 
—

 
—

 
—

Weighted-average shares-diluted
10,633

 
10,629

 
10,648

 
10,629

Loss per common share attributable to Alliance HealthCare Services, Inc.:
 
 
 
 
 
 
 
Basic
$
(0.08
)
 
$
(1.22
)
 
$
(0.53
)
 
$
(1.45
)
Diluted
$
(0.08
)
 
$
(1.22
)
 
$
(0.53
)
 
$
(1.45
)
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
858

 
291

 
714

 
310

Average exercise price per share that exceeds average market price of common stock
$
27.55

 
$
35.31

 
$
32.25

 
$
34.55