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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Class A Common Stock
                     
Dividend declared common stock, per share (in dollars per share) $ 0.176 $ 0.176 $ 0.176 $ 0.165 $ 1.265 $ 0.165 $ 0.165 $ 0.154 $ 0.693 $ 1.749 $ 0.605
Class B Common Stock
                     
Dividend declared common stock, per share (in dollars per share) $ 0.160 $ 0.160 $ 0.160 $ 0.150 $ 0.150 $ 0.150 $ 0.150 $ 0.140 $ 0.630 $ 1.590 $ 0.550