Consolidated Statement of Total Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Total Shareholders' Equity	Noncontrolling Interests
Beginning Balance at Dec. 31, 2015				$ (105,622)
Consolidated net earnings (loss)	$ 326,647
Ending Balance at Sep. 30, 2016	4,158,398			(104,511)
Beginning Balance at Jun. 30, 2016				(106,068)
Consolidated net earnings (loss)	159,478
Ending Balance at Sep. 30, 2016	4,158,398			(104,511)
Beginning Balance at Dec. 31, 2016	4,142,590	$ 630	$ 3,334,461	(130,687)	$ 935,574	$ 4,139,978	$ 2,612
Beginning Balance (in shares) at Dec. 31, 2016		63,176
Consolidated net earnings (loss)	336,087				336,159	336,159	(72)
Other comprehensive earnings, net of tax	7,769			7,759		7,759	10
Dividends declared	(80,961)				(80,961)	(80,961)
Issuances of common stock for stock award plans	4,587	$ 2	4,585			4,587
Issuances of common stock for stock award plans (in shares)		141
Repurchases of common stock	(99,999)	$ (5)			(99,994)	(99,999)
Repurchases of common stock, Shares		(458)
Stock-based compensation expense	23,698		23,698			23,698
Contributions by owners of noncontrolling interest	211						211
Ending Balance at Sep. 30, 2017	4,333,982	$ 627	3,362,744	(122,928)	1,090,778	4,331,221	2,761
Ending Balance (in shares) at Sep. 30, 2017		62,859
Beginning Balance at Jun. 30, 2017				(125,906)
Consolidated net earnings (loss)	151,539
Ending Balance at Sep. 30, 2017	$ 4,333,982	$ 627	$ 3,362,744	$ (122,928)	$ 1,090,778	$ 4,331,221	$ 2,761
Ending Balance (in shares) at Sep. 30, 2017		62,859