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Consolidated Balance Sheets (Parenthetical) - $ / shares | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Class A |  |
Common Stock, par value | $ 0.01 | $ 0.01
Common Stock, shares authorized | 12,000,000 | 12,000,000
Common Stock, shares issued | 6,577,100 | 6,595,308
Common Stock, shares outstanding | 6,577,100 | 6,595,308
Class B |  |
Common Stock, par value | $ 0.01 | $ 0.01
Common Stock, shares authorized | 150,000,000 | 150,000,000
Common Stock, shares issued | 84,092,304 | 86,947,407
Common Stock, shares outstanding | 84,092,304 | 86,947,407
Class C |  |
Common Stock, par value | $ 0.01 | $ 0.01
Common Stock, shares authorized | 1,200,000 | 1,200,000
Common Stock, shares issued | 661,688 | 663,940
Common Stock, shares outstanding | 661,688 | 663,940
Class D |  |
Common Stock, par value | $ 0.01 | $ 0.01
Common Stock, shares authorized | 5,000,000 | 5,000,000
Common Stock, shares issued | 18,653 | 20,868
Common Stock, shares outstanding | 18,653 | 20,868

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