CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Total Shareholders' Equity	Noncontrolling Interests
BALANCE, beginning of year (in shares) at Dec. 31, 2018		139,654
Balance, beginning of year at Dec. 31, 2018	$ 2,980,253	$ 1,396	$ 82,106	$ (543,531)	$ 3,294,154	$ 2,834,125	$ 146,128
Increase (Decrease) in Shareholders' Equity
Net earnings (loss)	(45,045)				(68,904)	(68,904)	23,859
Other comprehensive loss	45,395			44,910		44,910	485
Dividends	(29,705)		218		(29,923)	(29,705)
Distributions to noncontrolling interests	(10,152)						(10,152)
Capital contributions by noncontrolling interests	4,767						4,767
Other noncontrolling interest transactions	(440)		1,035			1,035	(1,475)
Stock-based plan activity (in shares)		455
Stock-based plan activity	11,100	$ 3	11,097			11,100
BALANCE, end of year (in shares) at Mar. 31, 2019		140,109
Balance, end of year at Mar. 31, 2019	2,976,717	$ 1,399	94,456	(498,621)	3,215,871	2,813,105	163,612
BALANCE, beginning of year (in shares) at Dec. 31, 2019		140,174
Balance, beginning of year at Dec. 31, 2019	1,584,092	$ 1,399	165,314	(379,873)	1,700,912	1,487,752	96,340
Increase (Decrease) in Shareholders' Equity
Net earnings (loss)	(256,450)				(265,959)	(265,959)	9,509
Other comprehensive loss	(123,697)			(119,480)		(119,480)	(4,217)
Dividends	(14,131)				(14,131)	(14,131)
Distributions to noncontrolling interests	(2,751)						(2,751)
Capital contributions by noncontrolling interests	19,968						19,968
Other noncontrolling interest transactions	343		672			672	(329)
Stock-based plan activity (in shares)		359
Stock-based plan activity	4,768	$ 4	4,764			4,768
BALANCE, end of year (in shares) at Mar. 31, 2020		140,533
Balance, end of year at Mar. 31, 2020	$ 1,210,165	$ 1,403	$ 170,750	$ (499,353)	$ 1,418,845	$ 1,091,645	$ 118,520