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)	$ 167,169
Ending Balance at Jun. 30, 2016	4,016,500			(106,068)
Beginning Balance at Mar. 31, 2016				(103,833)
Consolidated net earnings (loss)	122,113
Ending Balance at Jun. 30, 2016	4,016,500			(106,068)
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)	184,548				184,613	184,613	(65)
Other comprehensive earnings, net of tax	4,783			4,781		4,781	2
Dividends declared	(53,135)				(53,135)	(53,135)
Issuances of common stock for stock award plans	3,806	$ 2	3,804			3,806
Issuances of common stock for stock award plans (in shares)		122
Repurchases of common stock	(99,999)	$ (5)			(99,994)	(99,999)
Repurchases of common stock, Shares		(458)
Stock-based compensation expense	17,727		17,727			17,727
Contributions by owners of noncontrolling interest	211						211
Ending Balance at Jun. 30, 2017	4,200,531	$ 627	3,355,992	(125,906)	967,058	4,197,771	2,760
Ending Balance (in shares) at Jun. 30, 2017		62,840
Beginning Balance at Mar. 31, 2017				(128,425)
Consolidated net earnings (loss)	142,241
Ending Balance at Jun. 30, 2017	$ 4,200,531	$ 627	$ 3,355,992	$ (125,906)	$ 967,058	$ 4,197,771	$ 2,760
Ending Balance (in shares) at Jun. 30, 2017		62,840