CONSOLIDATED STATEMENTS OF EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Other Accumulated Comprehensive Income (Loss)	Noncontrolling Interests	Treasury Stock	Comprehensive Income
Balances at Dec. 31, 2008	$ 1,632,313	$ 545	$ 541,686	$ 1,820,385	$ (1,411)	$ 8,427	$ (737,319)
Balances (in shares) at Dec. 31, 2008		181,820,000					36,913,000
Increase (Decrease) in Stockholders' Equity
Issuance of common stock (net of expenses) and proceeds from exercise of stock options, including related tax effect	420,930	84	420,846
Issuance of common stock (net of expenses) and proceeds from exercise of stock options, including related tax effect (in shares)		33,857,000
Dividends declared	(66,690)			(66,690)
Contributions from noncontrolling investors	5,000					5,000
Change in noncontrolling investment	2,366					2,366
Tax adjustment to noncontrolling interests	2,039					2,039
Equity-based compensation	16,915		10,453				6,462
Equity-based compensation (in shares)		323,000					(323,000)
Comprehensive loss:
Net loss	(11,019)			(8,184)		(2,835)		(11,019)
Reversal of unrealized loss on interest rate swap, net of tax of $883	1,411				1,411			1,411
Comprehensive income and net income (loss)	(9,608)							(9,608)
Balances at Dec. 31, 2009	2,003,265	629	972,985	1,745,511		14,997	(730,857)
Balances (in shares) at Dec. 31, 2009		216,000,000					36,590,000
Increase (Decrease) in Stockholders' Equity
Issuance of common stock (net of expenses) and proceeds from exercise of stock options, including related tax effect	14,014	4	14,010
Issuance of common stock (net of expenses) and proceeds from exercise of stock options, including related tax effect (in shares)		1,413,000
Dividends declared	(65,087)			(65,087)
Contributions from noncontrolling investors	5,348					5,348
Transfer to redeemable noncontrolling interest	(23,800)					(23,800)
Tax adjustment to noncontrolling interests	(1,470)					(1,470)
Equity-based compensation	14,966		11,733				3,233
Equity-based compensation (in shares)		162,000					(162,000)
Comprehensive loss:
Net loss	129,599			140,709		(11,110)		129,599
Balances at Dec. 31, 2010	2,076,835	633	998,728	1,821,133		(16,035)	(727,624)
Balances (in shares) at Dec. 31, 2010	217,574,826	217,575,000					36,428,000
Increase (Decrease) in Stockholders' Equity
Issuance of common stock (net of expenses) and proceeds from exercise of stock options, including related tax effect	13,396	3	13,393
Issuance of common stock (net of expenses) and proceeds from exercise of stock options, including related tax effect (in shares)		1,050,000
Dividends declared	(87,452)			(87,452)
Contributions from noncontrolling investors	12,989					12,989
Distributions to noncontrolling investor	(567)					(567)
Equity-based compensation	19,007		14,036				4,971
Equity-based compensation (in shares)		249,000					(249,000)
Comprehensive loss:
Net loss	265,692			278,120		(12,428)		265,692
Balances at Dec. 31, 2011	$ 2,299,900	$ 636	$ 1,026,157	$ 2,011,801		$ (16,041)	$ (722,653)
Balances (in shares) at Dec. 31, 2011	218,873,720	218,874,000					36,179,000