CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income including non-controlling interests	$ 276,580	$ 206,144	$ 293,083
Unrealized gain (loss) on derivatives designated and qualifying as cash flow hedges, net of tax of $1,523 in 2021; $605 in 2020; $(58) in 2019	5,607	861	(68)
Defined pension plan activity, net of tax of $33,214 in 2021; $(10,622) in 2020; $4,188 in 2019	88,539	(31,224)	11,503
Currency translation adjustment	(49,745)	4,068	6,735
Other comprehensive income (loss):	44,401	(26,295)	18,170
Comprehensive income	320,981	179,849	311,253
Comprehensive income (loss) attributable to non-controlling interests	(289)	74	255
Comprehensive income (loss) attributable to shareholders	$ 321,270	$ 179,775	$ 310,998