CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net earnings		$ 74,788	$ 50,650	$ 118,431	$ 83,197
Other comprehensive income
Foreign currency translation, net of tax	[1]	(43,771)	32,677	(28,360)	43,901
Pension and postretirement adjustments, net of tax	[2]	3,062	1,743	5,684	3,694
Other comprehensive income (loss), net of tax		(40,709)	34,420	(22,676)	47,595
Comprehensive income		$ 34,079	$ 85,070	$ 95,755	$ 130,792

[1] The tax benefit included in other comprehensive loss for foreign currency translation adjustments for the three and six months ended June 30, 2018 was $2.0 million and $1.2 million, respectively. The tax expense included in other comprehensive income for foreign currency translation adjustments for the three and six months ended June 30, 2017 was $1.1 million and $1.2 million, respectively.

[2] The tax expense included in other comprehensive income for pension and postretirement adjustments for the three and six months ended June 30, 2018 was $0.9 million and $1.8 million, respectively. The tax expense included in other comprehensive income for pension and postretirement adjustments for the three and six months ended June 30, 2017 was $1.2 million and $2.5 million, respectively.