Equity and Noncontrolling Interest - AOCI Reclassifications (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	$ (65,100)	$ (87,407)	$ (73,316)
Other Comprehensive (Loss) Income, before Reclassifications, before Tax	(18,508)	21,015	(17,106)
Amounts Reclassed from AOCI	3,520	2,660	3,058
Related Tax Amounts	(627)	(1,368)	(43)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(80,715)	(65,100)	(87,407)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	(31,893)	(52,255)	(38,544)
Other Comprehensive (Loss) Income, before Reclassifications, before Tax	(17,429)	20,362	(13,711)
Amounts Reclassed from AOCI	0	0	0
Related Tax Amounts	0	0	0
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(49,322)	(31,893)	(52,255)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	(34,093)	(36,168)	(35,251)
Other Comprehensive (Loss) Income, before Reclassifications, before Tax	1,543	(1,646)	(4,229)
Amounts Reclassed from AOCI	3,085	5,154	3,075
Related Tax Amounts	(1,086)	(1,433)	237
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(30,551)	(34,093)	(36,168)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	886	1,016	479
Other Comprehensive (Loss) Income, before Reclassifications, before Tax	(2,622)	2,299	834
Amounts Reclassed from AOCI	435	(2,494)	(17)
Related Tax Amounts	459	65	(280)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	$ (842)	$ 886	$ 1,016