Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Employee Stock Option [Member]	Sep. 30, 2011 Employee Stock Option [Member]	Sep. 30, 2012 Employee Stock Option [Member]	Sep. 30, 2011 Employee Stock Option [Member]	Sep. 30, 2012 Restricted Stock [Member]	Sep. 30, 2011 Restricted Stock [Member]	Sep. 30, 2012 Restricted Stock [Member]	Sep. 30, 2011 Restricted Stock [Member]	Sep. 30, 2012 Equity Plans [Member]	Sep. 30, 2012 Equity Plans [Member] Non-employee Director [Member] Restricted Stock Units (RSUs) [Member]	Sep. 30, 2012 Common Stock Class A	Dec. 31, 2011 Common Stock Class A	Sep. 30, 2012 Common Stock Class A Restricted Stock [Member]
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]
Common stock, shares outstanding															113,962,889	114,047,637
Share-based compensation, shares outstanding																	420,276
Shares available for issuance under compensation plan, in shares													1,100,000	336,895
Computation of earnings per share:
Net income (loss) from continuing operations	$ (11,618)	$ (43,930)	$ (15,761)	$ (20,553)
Net income (loss) attributable to redeemable non-controlling interests in consolidated subsidiaries	(1,033)	(783)	(1,225)	2,473
Net income (loss) from continuing operations less Net income (loss) attributable to redeemable non-controlling interests in consolidated subsidiaries	(10,585)	(43,147)	(14,536)	(23,026)
Net income (loss) from discontinued operations, net of tax	$ 0	$ (5,087)	$ 0	$ (5,087)
Shares for basic and diluted calculations:
Weighted average shares used in basic computation	114,989,000	115,664,000	114,587,000	89,118,000
Shares attributable to share-based payment awards					0	0	0	0	0	0	0	0
Weighted average shares used in diluted computation	114,989,000	115,664,000	114,587,000	89,118,000
Earnings (loss) per share:
Income (loss) from continuing operations, basic (in dollars per share)	$ (0.09)	$ (0.37)	$ (0.13)	$ (0.26)
Income (loss) from discontinued operations, basic (in dollars per share)	$ 0.00	$ (0.04)	$ 0.00	$ (0.06)
Income (loss) from continuing operations, diluted (in dollars per share)	$ (0.09)	$ (0.37)	$ (0.13)	$ (0.26)
Income (loss) from discontinued operations, diluted (in dollars per share)	$ 0.00	$ (0.04)	$ 0.00	$ (0.06)