Equity and Noncontrolling Interest - Reclassifications (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Loss, Balance at Beginning of Period	$ (80,715)	$ (65,100)
Other Comprehensive Income (Loss) Before Reclassifications	1,436	5,624
Amounts Reclassified from AOCI	637	611
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	2,073	6,235
Related Tax Amounts	(525)	127
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	1,548	6,362
Accumulated Other Comprehensive Loss, Balance at End of Period	(79,167)	(58,738)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Loss, Balance at Beginning of Period	(49,322)	(31,893)
Other Comprehensive Income (Loss) Before Reclassifications	(431)	6,764
Amounts Reclassified from AOCI	0	0
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	(431)	6,764
Related Tax Amounts	0	0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(431)	6,764
Accumulated Other Comprehensive Loss, Balance at End of Period	(49,753)	(25,129)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Loss, Balance at Beginning of Period	(30,551)	(34,093)
Other Comprehensive Income (Loss) Before Reclassifications	160	(697)
Amounts Reclassified from AOCI	733	783
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	893	86
Related Tax Amounts	(187)	(2)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	706	84
Accumulated Other Comprehensive Loss, Balance at End of Period	(29,845)	(34,009)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Loss, Balance at Beginning of Period	(842)	886
Other Comprehensive Income (Loss) Before Reclassifications	1,707	(443)
Amounts Reclassified from AOCI	(96)	(172)
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	1,611	(615)
Related Tax Amounts	(338)	129
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	1,273	(486)
Accumulated Other Comprehensive Loss, Balance at End of Period	$ 431	$ 400