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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Diluted Earnings per Share
Diluted earnings (loss) per share for years ended December 31, 2018, 2017 and 2016 includes the effects of potential common shares when dilutive and is as follows:
 
2018
 
2017
 
2016
Net income (loss) attributable to common stockholders
$
44,512

 
$
(1,705
)
 
$
6,785

Weighted average number of common shares outstanding
30,277

 
29,942

 
29,530

Dilutive effect of restricted stock grants after application of the treasury stock method
310

 
—

 
348

 
 
 
 
 
 
Dilutive shares outstanding
30,587

 
29,942

 
29,878

Basic earnings (loss) per share attributable to common stockholders
$
1.47

 
$
(0.06
)
 
$
0.23

Diluted earnings (loss) per share attributable to common stockholders
$
1.46

 
$
(0.06
)
 
$
0.23