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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net income including non-controlling interests	$ 247,475	$ 198,373	$ 127,412
Unrealized (loss) gain on derivatives designated and qualifying as cash flow hedges, net of tax of $17 in 2017; $(21) in 2016; $336 in 2015	288	39	557
Defined pension plan activity, net of tax of $19,252 in 2017, $4,297 in 2016; $61,538 in 2015	10,662	3,837	98,117
Currency translation adjustment	71,016	(36,752)	(106,935)
Transactions with non-controlling interests	0	0	(7)
Other comprehensive income (loss)	81,966	(32,876)	(8,268)
Comprehensive income	329,441	165,497	119,144
Comprehensive (loss) income attributable to non-controlling interests	87	(132)	(689)
Comprehensive income attributable to shareholders	329,354	165,629	119,833
Accumulated Other Comprehensive Income (Loss) [Member]
Unrealized (loss) gain on derivatives designated and qualifying as cash flow hedges, net of tax of $17 in 2017; $(21) in 2016; $336 in 2015	288	39	557
Defined pension plan activity, net of tax of $19,252 in 2017, $4,297 in 2016; $61,538 in 2015	10,662	3,837	98,117
Currency translation adjustment	$ 70,901	$ (36,646)	$ (106,312)

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