Consolidated Statements Of Changes In Equity (USD $) In Thousands, except Share data, unless otherwise specified	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, 2011		$ 173,187	$ 0	$ 443,058	$ 132,222	$ 748,467	$ 170,636
Balance (in shares) at Dec. 31, 2011		31,284,000	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	223,643			62,563	26,303	88,866	134,777
Issuance of restricted stock (in shares)		281,000
Cancellation of restricted stock (in shares)		(2,000)
Stock options exercised		18,214				18,214
Stock options exercised (in shares)	841,599	842,000
Stock repurchased		(13,101)				(13,101)
Stock repurchased (in shares)		(464,000)
Share-based compensation		6,692				6,692
Tax benefit related to exercise of stock options		1,834				1,834
Distributions to noncontrolling interests, net of capital contributions					(26,514)	(26,514)	(136,356)
Acquisitions and other transactions impacting noncontrolling interests		252			174,615	174,867	6,957
Disposals and other transactions impacting noncontrolling interests		(3,211)			4,352	1,141	(632)
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 stock options		7,247				7,247
Distributions to noncontrolling interests, net of capital contributions					(49,533)	(49,533)	(134,298)
Acquisitions and other transactions impacting noncontrolling interests		679			48,115	48,794	(319)
Disposals and other transactions impacting noncontrolling interests		(1,626)			2,010	384	(2,120)
Balance at Dec. 31, 2013	1,125,556	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 stock options		3,177				3,177
Dividends paid on preferred stock				(4,503)		(4,503)
Distributions to noncontrolling interests, net of capital contributions					(56,439)	(56,439)	(133,594)
Acquisitions and other transactions impacting noncontrolling interests		744			54,725	55,469	6,482
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