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Per Share Information (Tables)
3 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Basic and Diluted Earnings Per Share Attributable to Common Stock
The amounts used to compute the basic and diluted earnings per share attributable to common stock for the three months ended March 31, 2018 and 2017 are illustrated below (in thousands):
 
 
Three Months Ended
 
 
March 31,
 
 
2018

2017
Amounts attributable to common stock:
 
 
 
 
Net income attributable to common stock
 
$
37,614

 
$
48,267

 
 
 
 
 
Weighted average shares:
 
 
 
 
Weighted average shares outstanding for basic earnings per share attributable to common stock
 
156,546

 
155,168

Effect of dilutive unvested non-participating stock-based awards
 
1,010

 

Weighted average shares outstanding for diluted earnings per share attributable to common stock
 
157,556

 
155,168