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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Activity of Common Stock Issued and Outstanding
The following table provides details with respect to changes in the number of shares of common stock, $0.01 par value, issued, held in treasury and outstanding during 2017.
 
 
Issued
 
Treasury Stock
 
Outstanding
Shares of common stock - December 31, 2016
 
62,295,870

 
10,921,509

 
51,374,361

Restricted stock awards, net of forfeitures
 
425,828

 

 
425,828

Shares withheld for taxes on vesting of restricted stock awards
 

 
149,002

 
(149,002
)
Purchase of treasury stock
 

 
561,765

 
(561,765
)
Shares of common stock - December 31, 2017
 
62,721,698

 
11,632,276

 
51,089,422