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Stockholder's Equity (Tables)
 12 Months Ended
Dec. 31, 2019
Stockholders' Equity Note [Abstract]  
Common stock activity

The following summarizes Common Stock activity for each of the years ended December 31, 2017, 2018 and 2019 (in thousands):
 
Common Shares
 
Issued
 
Treasury
 
Outstanding
 
 
 
 
 
 
Balance at December 31, 2016
576,950

 
(250
)
 
576,700

Common Stock Issued Under Stock-Based Compensation Plans
1,878

 
—

 
1,878

Treasury Stock Purchased (1)
—

 
(686
)
 
(686
)
Common Stock Issued Under Employee Stock Purchase Plan
—

 
180

 
180

Treasury Stock Issued Under Stock-Based Compensation Plans
—

 
405

 
405

Balance at December 31, 2017
578,828

 
(351
)
 
578,477

Common Stock Issued Under Stock-Based Compensation Plans
1,580

 
—

 
1,580

Treasury Stock Purchased (1)
—

 
(539
)
 
(539
)
Common Stock Issued Under Employee Stock Purchase Plan
—

 
180

 
180

Treasury Stock Issued Under Stock-Based Compensation Plans
—

 
325

 
325

Balance at December 31, 2018
580,408

 
(385
)
 
580,023

Common Stock Issued Under Stock-Based Compensation Plans
1,688

 
—

 
1,688

Treasury Stock Purchased (1)
—

 
(310
)
 
(310
)
Common Stock Issued Under Employee Stock Purchase Plan
117

 
106

 
223

Treasury Stock Issued Under Stock-Based Compensation Plans
—

 
290

 
290

Balance at December 31, 2019
582,213

 
(299
)
 
581,914


 

(1)
Represents shares that were withheld by or returned to EOG (i) in satisfaction of tax withholding obligations that arose upon the exercise of employee stock options or SARs or the vesting of restricted stock, restricted stock unit, performance unit grants or (ii) in payment of the exercise price of employee stock options.