Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Stock Appreciation Rights (SARs)	Mar. 31, 2012 Stock Appreciation Rights (SARs)	Mar. 31, 2013 Restricted Stock	Mar. 31, 2012 Restricted Stock	Mar. 31, 2013 Non-employee Director Equity Plans Restricted Stock Units (RSUs)	Mar. 31, 2013 Common Stock Class A	Dec. 31, 2012 Common Stock Class A
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]
Common stock, shares outstanding, shares								115,651,799	112,447,892
Common stock, restricted shares, shares							336,895	336,895	336,895
Computation of earnings per share:
Net income (loss)	$ 919	$ 6,236
Net income (loss) attributable to redeemable non-controlling interests in consolidated subsidiaries	3,495	2,241
Net income (loss) from continuing operations less Net income (loss) attributable to redeemable non-controlling interests in consolidated subsidiaries	$ (2,576)	$ 3,995
Shares for basic and diluted calculations:
Weighted average shares used in basic computation, shares	113,798,000	114,281,000
Shares attributable to share-based payment awards, shares			0	0	0	1,382,000
Weighted average shares used in diluted computation, shares	113,798,000	115,663,000
Earnings (loss) per share:
Basic, dollars per share	$ (0.02)	$ 0.03
Diluted, dollars per share	$ (0.02)	$ 0.03