Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Common Stock Common Stock	Common Stock Exchangeable Shares	Preferred Stock Series F	Preferred Stock Series G	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock	Total Stockholders' Equity	Non-controlling Interests
Balance (in shares) at Dec. 31, 2016		144,710,773	6,515,453	1	1
Balance at Dec. 31, 2016	$ 3,342,702	$ 1	$ 0	$ 0	$ 0	$ 1,749,306	$ 1,876,081	$ (271,673)	$ (14,288)	$ 3,339,427	$ 3,275
Other comprehensive income (loss)	68,278							68,278		68,278
Acquisitions (in shares)		2,982,346
Acquisitions	89,604					89,604				89,604
Stock-based compensation activity (in shares)		1,000,935
Stock-based compensation activity	29,259	$ 1				50,421			(21,163)	29,259
Stock options exercised (in shares)		1,223
Stock options exercised	25					25				25
Exchange of exchangeable shares (in shares)		6,029,341	(6,029,341)
Common stock repurchases (in shares)		(1,382,292)
Common stock repurchases	(50,000)								(50,000)	(50,000)
Retirement of preferred stock (in shares)				(1)
Retirement of preferred stock	0
Distributions to non-controlling interests	(2,001)										(2,001)
Buyout of a non-controlling interest	(463)										(463)
Net income	318,225						314,978			314,978	3,247
Balance (in shares) at Dec. 31, 2017		153,342,326	486,112	0	1
Balance at Dec. 31, 2017	3,795,629	$ 2	$ 0	$ 0	$ 0	1,889,356	2,191,059	(203,395)	(85,451)	3,791,571	4,058
Other comprehensive income (loss)	(82,653)							(82,653)		(82,653)
Acquisitions (in shares)		679,668
Acquisitions	22,882					22,882				22,882
Stock-based compensation activity (in shares)		998,631
Stock-based compensation activity	37,417	$ 0				55,116			(17,699)	37,417
Common stock repurchases (in shares)		(13,916,725)
Common stock repurchases	(451,290)								(451,290)	(451,290)
Dividends declared	(5,838)						(5,838)			(5,838)
Distributions to non-controlling interests	(4,038)										(4,038)
Buyout of a non-controlling interest	(1,387)										(1,387)
Net income	296,007						293,346			293,346	2,661
Balance (in shares) at Dec. 31, 2018		141,103,900	486,112	0	1
Balance at Dec. 31, 2018	3,605,453	$ 2	$ 0	$ 0	$ 0	1,967,354	2,477,291	(286,048)	(554,440)	3,604,159	1,294
Other comprehensive income (loss)	44,230							44,230		44,230
Acquisitions (in shares)		60,860
Acquisitions	1,791					1,791				1,791
Stock-based compensation activity (in shares)		1,085,165
Stock-based compensation activity	35,086	$ 0				55,465			(20,379)	35,086
Exchange of exchangeable shares (in shares)		449,929	(449,929)
Common stock repurchases (in shares)		(375,536)
Common stock repurchases	(11,954)								(11,954)	(11,954)
Dividends declared	(25,064)						(25,064)			(25,064)	0
Retirement of preferred stock (in shares)					(1)
Retirement of preferred stock	0
Distributions to non-controlling interests	(2,526)										(2,526)
Net income	406,815						402,044			402,044	4,771
Balance (in shares) at Dec. 31, 2019		142,324,318	36,183	0	0
Balance at Dec. 31, 2019	$ 4,053,831	$ 2	$ 0	$ 0	$ 0	$ 2,024,610	$ 2,854,271	$ (241,818)	$ (586,773)	$ 4,050,292	$ 3,539