Earnings Per Share (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
Computation of earnings per share:
Net income (loss) from continuing operations	$ (8,195)	$ (11,618)	$ (10,380)	$ 6,236	$ (57,983)	$ (43,929)	$ 22,495	$ 880	$ (23,957)	$ (78,537)	$ (31,690)
Net income (loss) attributable to redeemable non-controlling interests in consolidated subsidiaries	1,154	(1,033)	(2,434)	2,241	3,354	(783)	2,458	798	(72)	5,827	13,727
Net income (loss) from continuing operations less Net income (loss) attributable to redeemable non-controlling interests in consolidated subsidiaries									(23,885)	(84,364)	(45,417)
Net income (loss) from discontinued operations, net of tax	$ 0	$ 0	$ 0	$ 0	$ (18,559)	$ (5,087)	$ 0	$ 0	$ 0	$ (23,646)	$ 0
Shares for basic and diluted calculations:
Weighted average shares used in basic computation	113,939,000	114,989,000	114,561,000	114,281,000		115,664,000	76,330,000	74,160,000	114,400,000	95,532,000	73,149,000
Weighted average shares used in diluted computation	113,939,000	114,989,000	114,561,000	115,663,000		115,664,000	77,898,000	76,083,000	114,400,000	95,532,000	73,149,000
Earnings (loss) per share:
Income (loss) from continuing operations, basic (in dollars per share)	$ (0.08)	$ (0.09)	$ (0.07)	$ 0.03	$ (0.54)	$ (0.37)	$ 0.25	$ 0.01	$ (0.21)	$ (0.88)	$ (0.62)
Income (loss) from discontinued operations, basic (in dollars per share)	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ (0.16)	$ (0.04)	$ 0	$ 0	$ 0.00	$ (0.25)	$ 0.00
Income (loss) from continuing operations, diluted (in dollars per share)	$ (0.08)	$ (0.09)	$ (0.07)	$ 0.03	$ (0.54)	$ (0.37)	$ 0.26	$ 0.00	$ (0.21)	$ (0.88)	$ (0.62)
Income (loss) from discontinued operations, diluted (in dollars per share)	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ (0.17)	$ (0.04)	$ 0.00	$ 0.00	$ 0.00	$ (0.25)	$ 0.00
Employee Stock Option
Shares for basic and diluted calculations:
Shares attributable to share-based payment awards									0	0	0
Restricted Stock
Shares for basic and diluted calculations:
Shares attributable to share-based payment awards									0	0	0
Equity Plans | Non-employee Director | Restricted Stock Units (RSUs)
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]
Common stock, restricted shares	336,895								336,895
Common Stock Class A
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]
Common stock, shares outstanding	112,447,892				114,047,637				112,447,892	114,047,637
Common stock, restricted shares	336,895				576,892				336,895	576,892