CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss) including noncontrolling interest	$ (1,262,445)	$ 1,253,302	$ 419,486	[1]
Other comprehensive income (loss), net of tax
Net gain (loss) from foreign currency translation	29,241	66,600	(145,022)
Retirement and postretirement benefit plans	(57,617)	(35,979)	29,110
Deferred loss on interest rate hedges reclassified to interest expense	1,204	5,005	2,342
Reclassification of certain tax effects to retained earnings	0	0	(30,237)
Other	0	0	(3,737)
Other comprehensive income (loss)	(27,172)	35,626	(147,544)
COMPREHENSIVE INCOME (LOSS)	$ (1,289,617)	$ 1,288,928	$ 271,942

[1] Reclassified to conform with current presentation