Interim Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 26,037	$ 12,989	$ 43,499	$ 28,517
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of tax expense of zero and zero, and $(115) and zero, respectively	4,566	5,604	556	(14,850)
Recognition of deferred pension and other post-retirement benefits, net of tax expense of $(67) and $(52), and $(134) and $(104), respectively	252	194	503	388
Unrealized income (loss) on derivative instruments, net of tax (expense) benefit of $(23) and $73, and $(601) and $1,381, respectively	(88)	1,144	(2,261)	5,534
Other comprehensive income (loss), net of tax	4,906	4,654	3,320	(19,996)
Comprehensive income	$ 30,943	$ 17,643	$ 46,819	$ 8,521