CONSOLIDATED STATEMENTS OF EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Noncontrolling Interests	Treasury Stock
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
Proceeds from exercise of stock options, including related tax effect	14,014	4	14,010
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 income and net income (loss)	129,599			140,709	(11,110)
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		217,575,000				36,428,000
Increase (Decrease) in Stockholders' Equity
Proceeds from exercise of stock options, including related tax effect	13,396	3	13,393
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 income and net income (loss)	265,692			278,120	(12,428)
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
Increase (Decrease) in Stockholders' Equity
Proceeds from exercise of stock options, including related tax effect	3,662	1	3,661
Proceeds from exercise of stock options, including related tax effect (in shares)		445,000
Dividends declared	(87,698)			(87,698)
Conversion of 5.125% convertible senior notes	4		(1)			5
Contributions from noncontrolling investors	9,839				9,839
Distributions to noncontrolling investor	(151)				(151)
Equity-based compensation	10,005		7,870	(34)		2,169
Equity-based compensation (in shares)		204,000				(109,000)
Comprehensive income and net income (loss)	142,281			163,551	(21,270)
Balances at Dec. 31, 2012	$ 2,377,842	$ 637	$ 1,037,687	$ 2,087,620	$ (27,623)	$ (720,479)
Balances (in shares) at Dec. 31, 2012	219,522,655	219,523,000				36,070,000