Condensed Consolidated Statement of Stockholders' Equity (USD $) In Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Noncontrolling Interests [Member]	Total
Balance, value at Dec. 31, 2011	$ 1	$ 2,081,242	$ 124,816	$ (177,459)	$ 6,339	$ 2,034,939
Balance, shares at Dec. 31, 2011	105,410
Net income (loss) for three months ended March 31, 2012			31,293		(184)	31,109
Dividends on common shares			(8,482)			(8,482)
Shares issued in connection with share-based compensation plans, shares	669
Shares issued in connection with share-based compensation plans, value		(969)	(181)			(1,150)
Share-based compensation expense		6,148				6,148
Purchase of subsidiary shares from /other decreases in noncontrolling interests		668			(668)
Sale of subsidiary shares to/other increases in noncontrolling interests					28	28
Distributions to noncontrolling interests					(506)	(506)
Other comprehensive income (Note 14)				30,396	3	30,399
Balance, value at Mar. 31, 2012	$ 1	$ 2,087,089	$ 147,446	$ (147,063)	$ 5,012	$ 2,092,485
Balance, shares at Mar. 31, 2012	106,079