Basic and Diluted Net Income (Loss) Per Share (Details 2) (Class A common stock)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock awards
Antidilutive securities excluded from computation of earnings per share
Anti-dilutive securities excluded from computation of earnings per share	700,000	2,500,000	5,000,000
Performance based options
Antidilutive securities excluded from computation of earnings per share
Dilutive securities excluded from computation of earnings per share	7,791,000	7,929,000	9,549,000
Restricted Performance Units
Antidilutive securities excluded from computation of earnings per share
Dilutive securities excluded from computation of earnings per share	1,943,000	1,185,000	1,285,000
Long-Term Performance Based Plans
Antidilutive securities excluded from computation of earnings per share
Dilutive securities excluded from computation of earnings per share	9,734,000	9,114,000	10,834,000