Equity - AOCI Reclassifications (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Beginning Balance	$ (35,943)	$ (109,264)	$ (26,598)	$ (78,170)
Other Comprehensive (Loss) Income, before reclassifications	(18,935)	33,970	(26,804)	(14,930)
Amounts Reclassed from AOCI	533	480	(836)	25,321
Related Tax Amounts	(378)	(196)	(485)	(7,231)
Ending Balance	(54,723)	(75,010)	(54,723)	(75,010)
Currency Translation Adjustments [Member]
Beginning Balance	(12,177)	(88,637)	(2,875)	(44,568)
Other Comprehensive (Loss) Income, before reclassifications	(19,905)	33,601	(29,207)	(10,468)
Amounts Reclassed from AOCI	0	0	0	0
Related Tax Amounts	0	0	0	0
Ending Balance	(32,082)	(55,036)	(32,082)	(55,036)
Defined Benefit Pension Plans [Member]
Beginning Balance	(21,778)	(17,363)	(23,467)	(34,533)
Other Comprehensive (Loss) Income, before reclassifications	488	(901)	1,009	(409)
Amounts Reclassed from AOCI	709	584	2,423	25,550
Related Tax Amounts	(293)	60	(839)	(8,228)
Ending Balance	(20,874)	(17,620)	(20,874)	(17,620)
Unrealized Gain (Loss) in Available-for-Sale Securities [Member]
Beginning Balance	596	1,148	3,342	1,251
Other Comprehensive (Loss) Income, before reclassifications	(85)	810	(489)	802
Amounts Reclassed from AOCI	(176)	(104)	(3,259)	(229)
Related Tax Amounts	46	(150)	787	(120)
Ending Balance	381	1,704	381	1,704
Derivative Instruments
Beginning Balance	(2,584)	(4,412)	(3,598)	(320)
Other Comprehensive (Loss) Income, before reclassifications	567	460	1,883	(4,855)
Amounts Reclassed from AOCI	0	0	0	0
Related Tax Amounts	(131)	(106)	(433)	1,117
Ending Balance	$ (2,148)	$ (4,058)	$ (2,148)	$ (4,058)