Equity and Noncontrolling Interest - Reclassifications (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Loss, Balance at Beginning of Period	$ (87,407)	$ (73,316)
Other Comprehensive Income (Loss) Before Reclassifications	5,252	4,386
Amounts Reclassified from AOCI	490	1,296
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	5,742	5,682
Related Tax Amounts	(296)	(368)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	5,446	5,314
Accumulated Other Comprehensive Loss, Balance at End of Period	(81,961)	(68,002)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Loss, Balance at Beginning of Period	(52,255)	(38,544)
Other Comprehensive Income (Loss) Before Reclassifications	4,928	4,671
Amounts Reclassified from AOCI	0	0
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	4,928	4,671
Related Tax Amounts	0	0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	4,928	4,671
Accumulated Other Comprehensive Loss, Balance at End of Period	(47,327)	(33,873)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Loss, Balance at Beginning of Period	(36,168)	(35,251)
Other Comprehensive Income (Loss) Before Reclassifications	(341)	(477)
Amounts Reclassified from AOCI	850	798
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	509	321
Related Tax Amounts	(191)	(134)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	318	187
Accumulated Other Comprehensive Loss, Balance at End of Period	(35,850)	(35,064)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Loss, Balance at Beginning of Period	1,016	479
Other Comprehensive Income (Loss) Before Reclassifications	665	192
Amounts Reclassified from AOCI	(360)	498
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	305	690
Related Tax Amounts	(105)	(234)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	200	456
Accumulated Other Comprehensive Loss, Balance at End of Period	$ 1,216	$ 935