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Earnings (Loss) Per Share
3 Months Ended
Mar. 31, 2020
Earnings Per Share [Abstract]  
Earnings (Loss) Per Share Earnings (Loss) Per Share
Basic earnings per share is calculated using our weighted-average outstanding common shares. The earnings per share amounts are the same for common stock and Class B common stock because the holders of each class are legally entitled to equal per share distributions whether through dividends or in liquidation.
Diluted earnings per share is calculated using our weighted-average outstanding common shares including the dilutive effect of stock awards as determined under the treasury stock method. In periods when we recognize a net loss, we exclude the impact of outstanding stock awards from the diluted loss per share calculation as their inclusion would have an antidilutive
effect. For the three months ended March 31, 2020 and 2019, approximately 18 million and 21 million of outstanding stock awards have been excluded from the calculations of diluted earnings per share attributable to common stockholders because their effect would have been antidilutive.