CONSOLIDATED STATEMENTS OF EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Noncontrolling Interests	Redeemable Noncontrolling Interests
Balances at Dec. 31, 2010	$ 2,076,835	$ 633	$ 998,728	$ 1,821,133	$ (727,624)	$ (16,035)	$ 54,294
Balances (in shares) at Dec. 31, 2010					36,428,000
Balances (in shares) at Dec. 31, 2010		217,575,000
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	16,400
Distributions to noncontrolling investors	(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	(722,653)	(16,041)	70,694
Balances (in shares) at Dec. 31, 2011					36,179,000
Balances (in shares) at Dec. 31, 2011		218,874,000
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	28,120
Distributions to noncontrolling investors	(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	(720,479)	(27,623)	98,814
Balances (in shares) at Dec. 31, 2012	36,070,246				36,070,000
Balances (in shares) at Dec. 31, 2012	219,522,655	219,523,000
Increase (Decrease) in Stockholders' Equity
Proceeds from exercise of stock options, including related tax effect	37,508	8	37,660		(160)
Proceeds from exercise of stock options, including related tax effect (in shares)		3,132,000
Dividends declared	(97,375)			(97,375)
Conversion of 5.125% convertible senior notes	4				4
Acquisition of noncontrolling interest			(2,232)			2,232
Contributions from noncontrolling investors	160					160	17,700
Distributions to noncontrolling investors	(439)					(439)
Equity-based compensation	14,639		12,579	(46)	2,106
Equity-based compensation (in shares)		212,000			(97,000)
Comprehensive income and net income (loss)	163,516			189,314		(25,798)
Balances at Dec. 31, 2013	$ 2,495,855	$ 645	$ 1,085,694	$ 2,179,513	$ (718,529)	$ (51,468)	$ 116,514
Balances (in shares) at Dec. 31, 2013	35,972,942				35,973,000
Balances (in shares) at Dec. 31, 2013	222,867,408	222,867,000