Consolidated Statements Of Changes In Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Mandatory Convertible Preferred Stock [Member]	Retained Earnings [Member]	Non-Controlling Interests - Non-Redeemable [Member]	Total Equity (Permanent) [Member]	Non-controlling Interests - Redeemable (Temporary Equity) [Member]
Balance at Dec. 31, 2012		$ 183,867	$ 0	$ 505,621	$ 310,978	$ 1,000,466	$ 175,382
Balance (in shares) at Dec. 31, 2012		31,941,000	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	$ 261,544			72,703	49,789	122,492	139,052
Issuance of restricted stock (in shares)		292,000
Cancellation of restricted stock (in shares)		(16,000)
Stock options exercised		$ 33,349				33,349
Stock options exercised (in shares)	1,392,366	1,393,000
Stock repurchased		$ (45,964)				(45,964)
Stock repurchased (in shares)		(1,257,000)
Share-based compensation		$ 8,321				8,321
Tax benefit related to exercise of share-based awards		7,247				7,247
Acquisitions and other transactions impacting noncontrolling interests		679			48,115	48,794	(319)
Distributions to noncontrolling interests, net of capital contributions					(49,533)	(49,533)	(134,298)
Disposals and other transactions impacting noncontrolling interests		(1,626)			2,010	384	(2,120)
Balance at Dec. 31, 2013		$ 185,873	$ 0	578,324	361,359	1,125,556	177,697
Balance (in shares) at Dec. 31, 2013		32,353,000	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	$ 244,793			53,701	56,048	109,749	135,044
Issuance of stock		$ 693,289	$ 166,632			859,921
Issuance of stock (in shares)		15,490,000	1,725,000
Issuance of restricted stock (in shares)		272,000
Cancellation of restricted stock (in shares)		(12,000)
Stock options exercised		$ 2,630				2,630
Stock options exercised (in shares)	111,743	111,000
Stock repurchased		$ (4,615)				(4,615)
Stock repurchased (in shares)		(101,000)
Share-based compensation		$ 10,104				10,104
Tax benefit related to exercise of share-based awards		3,177				3,177
Dividends paid on preferred stock				(4,503)		(4,503)
Acquisitions and other transactions impacting noncontrolling interests		744			54,725	55,469	6,482
Distributions to noncontrolling interests, net of capital contributions					(56,439)	(56,439)	(133,594)
Disposals and other transactions impacting noncontrolling interests		(5,809)			2,991	(2,818)	(1,530)
Balance at Dec. 31, 2014	$ 2,098,231	$ 885,393	$ 166,632	627,522	418,684	2,098,231	184,099
Balance (in shares) at Dec. 31, 2014		48,113,000	1,725,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	$ 381,116			162,947	67,568	230,515	150,601
Issuance of stock		$ 447,720				447,720
Issuance of stock (in shares)		5,835,000
Issuance of restricted stock (in shares)		314,000
Cancellation of restricted stock (in shares)		(14,000)
Stock options exercised		$ 2,584				2,584
Stock options exercised (in shares)	113,220	113,000
Stock repurchased		$ (3,684)				(3,684)
Stock repurchased (in shares)		(67,000)
Share-based compensation		$ 15,009				15,009
Tax benefit related to exercise of share-based awards		4,001				4,001
Dividends paid on preferred stock				(9,056)		(9,056)
Acquisitions and other transactions impacting noncontrolling interests		1,019			81,863	82,882	(725)
Distributions to noncontrolling interests, net of capital contributions					(66,294)	(66,294)	(147,182)
Disposals and other transactions impacting noncontrolling interests		(6,624)			(30,537)	(37,161)	(11,061)
Balance at Dec. 31, 2015	$ 2,764,747	$ 1,345,418	$ 166,632	$ 781,413	$ 471,284	$ 2,764,747	$ 175,732
Balance (in shares) at Dec. 31, 2015		54,294,000	1,725,000