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Stockholders' Equity (Deficit) (Tables)
 12 Months Ended
Dec. 31, 2015
Equity [Abstract]  
Diluted Earnings per Share
Diluted earnings per share for years ended December 31, 2015, 2014 and 2013 includes the effects of potential common shares consisting of common stock issuable upon exercise of outstanding stock options when dilutive (in thousands, except per share amounts):
 
2015
 
2014
 
2013
Net income attributable to common stockholders — basic and diluted
$
7,060

 
$
7,630

 
$
(12,445
)
Weighted average number of common shares outstanding
29,209

 
28,926

 
28,584

Dilutive effect of outstanding stock options and restricted stock grants after application of the treasury stock method
190

 
191

 
—

 
 
 
 
 
 
Dilutive shares outstanding
29,399

 
29,117

 
28,584

Basic earnings per share attributable to common stockholders
$
0.24

 
$
0.26

 
$
(0.44
)
Diluted earnings per share attributable to common stockholders
$
0.24

 
$
0.26

 
$
(0.44
)