Loss Per Share of Class A and Class B Common Stock Basic and Diluted Earnings Per Share, 2012 (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Net income (loss)									$ (51,031)		$ (297,762)	$ (413,386)
Adjustment of redeemable noncontrolling interests to redemption value									12,604		59,740	12,425
Net loss (income) attributable to noncontrolling interests									(3,742)		18,335	23,746
Net loss attributable to common stockholders									(67,377)		(373,494)	(456,320)
Weighted Average Number of Shares Outstanding, Basic	655,678,123	653,223,610	647,149,537	644,097,375	528,421,712	307,605,060	303,414,676	307,849,412	650,214,119		362,261,324	342,698,772
Earnings Per Share, Basic	$ (0.12)	$ 0.00	$ 0.04	$ (0.02)	$ (0.12)	$ (0.18)	$ (0.35)	$ (0.48)	$ (0.10)		$ (1.03)	$ (1.33)
Weighted Average Number of Shares Outstanding, Diluted	655,678,123	653,223,610	663,122,709	644,097,375	528,421,712	307,605,060	303,414,676	307,849,412	650,214,119		362,261,324	342,698,772
Earnings Per Share, Diluted	$ (0.12)	$ 0.00	$ 0.04	$ (0.02)	$ (0.12)	$ (0.18)	$ (0.35)	$ (0.48)	$ (0.10)		$ (1.03)	$ (1.33)
Common Class A [Member]
Net income (loss)									(50,842)
Adjustment of redeemable noncontrolling interests to redemption value									12,557
Net loss (income) attributable to noncontrolling interests									(3,728)
Net loss attributable to common stockholders									(67,127)
Weighted Average Number of Shares Outstanding, Basic									647,814,143
Earnings Per Share, Basic									$ (0.10)
Reallocation of net income attributable to common stockholders as a result of conversion of Class B									0	[1]
Allocation of net income attributable to common stockholders									(67,127)
Conversion of Class B									0	[1]
Employee stock options									0	[1]
Diluted Restricted Stock Adjustment									0	[1]
Weighted Average Number of Shares Outstanding, Diluted									647,814,143	[1]
Earnings Per Share, Diluted									$ (0.10)
Common Class B [Member]
Net income (loss)									(189)
Adjustment of redeemable noncontrolling interests to redemption value									47
Net loss (income) attributable to noncontrolling interests									(14)
Net loss attributable to common stockholders									(250)
Weighted Average Number of Shares Outstanding, Basic									2,399,976
Earnings Per Share, Basic									$ (0.10)
Reallocation of net income attributable to common stockholders as a result of conversion of Class B									0	[1]
Allocation of net income attributable to common stockholders									$ (250)
Conversion of Class B									0	[1]
Employee stock options									0	[1]
Diluted Restricted Stock Adjustment									0	[1]
Weighted Average Number of Shares Outstanding, Diluted									2,399,976	[1]
Earnings Per Share, Diluted									$ (0.10)

[1] (1)Conversion of Class B shares into Class A shares and outstanding equity awards have not been reflected in the diluted loss per share calculation for the year ended December 31, 2012 because the effect would be antidilutive.