Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2016	Dec. 31, 2015
Class A
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	12,000,000	12,000,000
Common Stock, shares issued	6,595,308	6,595,308
Common Stock, shares outstanding	6,595,308	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	89,348,958	91,013,487
Common Stock, shares outstanding	89,348,958	91,013,487
Class C
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	1,200,000	1,200,000
Common Stock, shares issued	663,940	663,940
Common Stock, shares outstanding	663,940	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	22,100	23,742
Common Stock, shares outstanding	22,100	23,742