Consolidated Balance Sheet (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Class of Stock [Line Items]
Common stock, par value (USD per share)	0.01	0.01
Class A Common Stock
Class of Stock [Line Items]
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares outstanding	7,167,506	7,167,506
Class B Common Stock
Class of Stock [Line Items]
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares outstanding	51,328,974	52,005,492