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Earnings Per Share (Details 1) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Schedule of Earnings Per Share, Basic and Diluted, Including Two Class Method [Line Items] |  |  |  |
Net income attributable to Graham Holdings Company common stockholders | $ 57,081 | $ 46,566 | $ 138,829 | $ 89,457
Less: Dividends paid-common stock outstanding and unvested restricted shares | (7,388) | (6,948) | (22,167) | (21,587)
Undistributed earnings | $ 49,693 | $ 39,618 | $ 116,662 | $ 67,870
Percent allocated to common stockholders | 99.43% | 99.33% | 99.43% | 99.33%
Undistributed Earnings Allocated To Common Stockholders | $ 49,410 | $ 39,352 | $ 115,997 | $ 67,416
Add: Dividends paid-common stock outstanding | 7,346 | 6,901 | 22,041 | 21,444
Numerator for basic earnings per share | 56,756 | 46,253 | 138,038 | 88,860
Add: Additional undistributed earnings due to dilutive stock options | 2 | 2 | 5 | 3
Numerator for diluted earnings per share | $ 56,758 | $ 46,255 | $ 138,043 | $ 88,863
Weighted average shares outstanding (shares) | 5,285 | 5,325 | 5,285 | 5,380
Denominator for diluted earnings per share (shares) | 5,329 | 5,362 | 5,328 | 5,417
Graham Holdings Company Common Stockholders: |  |  |  |
Basic income per common share in dollars per share | $ 10.74 | $ 8.69 | $ 26.12 | $ 16.52
Diluted income per common share in dollars per share | $ 10.65 | $ 8.63 | $ 25.91 | $ 16.40
Stock Option Plan [Member] |  |  |  |
Schedule of Earnings Per Share, Basic and Diluted, Including Two Class Method [Line Items] |  |  |  |
Add: Effect of dilutive stock options (shares) | 44 | 37 | 43 | 37

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