CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018		Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss) including noncontrolling interest	$ 1,253,302	$ 419,486	[1],[2]	$ (311,789)	[1],[2]
Other comprehensive income (loss), net of tax
Net gain (loss) from foreign currency translation	66,600	(145,022)		171,725
Retirement and postretirement benefit plans	(35,979)	29,110		(7,682)
Deferred loss on interest rate hedges reclassified to interest expense	5,005	2,342		1,926
Reclassification of certain tax effects to retained earnings	0	(30,237)		0
Other	0	(3,737)		0
Other comprehensive income (loss)	35,626	(147,544)		165,969
COMPREHENSIVE INCOME (LOSS)	$ 1,288,928	$ 271,942		$ (145,820)

[1] ¹ Reclassified to conform with current presentation (see Notes C and E). 2017 revenue is presented net of $58.9 million of transportation, gathering and processing costs as historically shown prior to the adoption of ASC 606 on January 1, 2018. See Notes to Consolidated Financial Statements, page 58.

[2] Reclassified to conform with current presentation (see Note E)