CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Total Shareholders' Equity	Noncontrolling Interests	Cumulative Effect, Period of Adoption, Adjustment ASU 2014-09	Cumulative Effect, Period of Adoption, Adjustment ASU 2014-09 Retained Earnings	Cumulative Effect, Period of Adoption, Adjustment ASU 2014-09 Total Shareholders' Equity	Cumulative Effect, Period of Adoption, Adjustment ASU 2014-09 Noncontrolling Interests
Increase (Decrease) in Shareholders' Equity
Cumulative adjustment for the adoption of ASC 606								$ 20,544	$ 20,544	$ 20,544
BALANCE, beginning of year (in shares) at Dec. 31, 2018		139,654,000
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)	(497,745)				(482,925)	(482,925)	(14,820)
Other comprehensive loss	32,671			32,465		32,465	206
Dividends	(59,445)		218		(59,663)	(59,445)
Distributions to noncontrolling interests	(15,572)						(15,572)
Capital contributions by noncontrolling interests	7,821						7,821
Other noncontrolling interest transactions	2,572		3,083			3,083	(511)
Stock-based plan activity (in shares)		520,000
Stock-based plan activity	27,639	$ 3	27,636			27,639
BALANCE, end of year (in shares) at Jun. 30, 2019		140,174,000
Balance, end of year at Jun. 30, 2019	2,498,738	$ 1,399	113,043	(511,066)	2,772,110	2,375,486	123,252
BALANCE, beginning of year (in shares) at Mar. 31, 2019		140,109,000
Balance, beginning of year at Mar. 31, 2019	2,976,717	$ 1,399	94,456	(498,621)	3,215,871	2,813,105	163,612
Increase (Decrease) in Shareholders' Equity
Net earnings (loss)	(452,700)				(414,021)	(414,021)	(38,679)
Other comprehensive loss	(12,724)			(12,445)		(12,445)	(279)
Dividends	(29,740)				(29,740)	(29,740)
Distributions to noncontrolling interests	(5,420)						(5,420)
Capital contributions by noncontrolling interests	3,054						3,054
Other noncontrolling interest transactions	3,012		2,048			2,048	964
Stock-based plan activity (in shares)		65,000
Stock-based plan activity	16,539		16,539			16,539
BALANCE, end of year (in shares) at Jun. 30, 2019		140,174,000
Balance, end of year at Jun. 30, 2019	2,498,738	$ 1,399	113,043	(511,066)	2,772,110	2,375,486	123,252
Increase (Decrease) in Shareholders' Equity
Cumulative adjustment for the adoption of ASC 606								$ (1,977)	$ (1,977)	$ (1,977)	$ 0
BALANCE, beginning of year (in shares) at Dec. 31, 2019		140,174,000
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)	(274,712)				(290,949)	(290,949)	16,237
Other comprehensive loss	(100,559)			(98,763)		(98,763)	(1,796)
Dividends	(14,120)				(14,120)	(14,120)
Distributions to noncontrolling interests	(10,831)						(10,831)
Capital contributions by noncontrolling interests	39,520						39,520
Other noncontrolling interest transactions	1,438		1,736			1,736	(298)
Stock-based plan activity (in shares)		391,000
Stock-based plan activity	8,043	$ 4	8,039			8,043
BALANCE, end of year (in shares) at Jun. 30, 2020		140,565,000
Balance, end of year at Jun. 30, 2020	1,230,894	$ 1,403	175,089	(478,636)	1,393,866	1,091,722	139,172
BALANCE, beginning of year (in shares) at Mar. 31, 2020		140,533,000
Balance, beginning of year at Mar. 31, 2020	1,210,165	$ 1,403	170,750	(499,353)	1,418,845	1,091,645	118,520
Increase (Decrease) in Shareholders' Equity
Net earnings (loss)	(18,262)				(24,990)	(24,990)	6,728
Other comprehensive loss	23,138			20,717		20,717	2,421
Distributions to noncontrolling interests	(8,080)						(8,080)
Capital contributions by noncontrolling interests	19,552						19,552
Other noncontrolling interest transactions	1,095		1,064			1,064	31
Stock-based plan activity (in shares)		32,000
Stock-based plan activity	3,286		3,275		11	3,286
BALANCE, end of year (in shares) at Jun. 30, 2020		140,565,000
Balance, end of year at Jun. 30, 2020	$ 1,230,894	$ 1,403	$ 175,089	$ (478,636)	$ 1,393,866	$ 1,091,722	$ 139,172