Statements Of Consolidated Comprehensive Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net income		$ (133,935)	$ (39,384)	$ 11,789
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments		(4,740)	(20,523)	34,119
Interest rate swap adjustments (1)		(5,390)	(1,516)	0
Other changes in plan assets - amortization of actuarial gains (losses)	[1]	(398)	(11,087)	4,877
Net periodic pension costs amortization (loss) gain	[2]	0	117	535
Other comprehensive income (loss)		(10,528)	(33,009)	39,531
COMPREHENSIVE INCOME		(144,463)	(72,393)	51,320
Pension Liability [Member]
Other comprehensive (loss) income, net of tax:
Net of Income tax effect		1,900	3,300	1,800
Pension Liability Adjustment [Member]
Other comprehensive (loss) income, net of tax:
Net of Income tax effect		$ 0	$ 0	$ 500

[1] Net of an income tax effect of $1.9 million, $3.3 million, and $1.8 million for the years ended December 31, 2019, 2018 and 2017, respectively.

[2] Net of an income tax effect of $0.0 million, $0.0 million, and $0.5 million for the years ended December 31, 2019, 2018 and 2017, respectively.