Equity and Noncontrolling Interest - Reclassifications (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss), Balance at Beginning of Period	$ (79,167)	$ (58,738)	$ (80,715)	$ (65,100)
Other Comprehensive Income (Loss) Before Reclassifications	(190)	(16,674)	1,246	(11,050)
Amounts Reclassified from AOCI	689	1,460	1,326	2,071
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	499	(15,214)	2,572	(8,979)
Related Tax Amounts	(213)	(399)	(738)	(272)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	286	(15,613)	1,834	(9,251)
Accumulated Other Comprehensive Income (Loss), Balance at End of Period	(78,881)	(74,351)	(78,881)	(74,351)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Balance at Beginning of Period	(49,753)	(25,129)	(49,322)	(31,893)
Other Comprehensive Income (Loss) Before Reclassifications	(543)	(16,940)	(974)	(10,176)
Amounts Reclassified from AOCI	0	0	0	0
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	(543)	(16,940)	(974)	(10,176)
Related Tax Amounts	0	0	0	0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(543)	(16,940)	(974)	(10,176)
Accumulated Other Comprehensive Income (Loss), Balance at End of Period	(50,296)	(42,069)	(50,296)	(42,069)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Balance at Beginning of Period	(29,845)	(34,009)	(30,551)	(34,093)
Other Comprehensive Income (Loss) Before Reclassifications	(79)	1,161	81	464
Amounts Reclassified from AOCI	732	779	1,465	1,562
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	653	1,940	1,546	2,026
Related Tax Amounts	(131)	(444)	(318)	(446)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	522	1,496	1,228	1,580
Accumulated Other Comprehensive Income (Loss), Balance at End of Period	(29,323)	(32,513)	(29,323)	(32,513)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Balance at Beginning of Period	431	400	(842)	886
Other Comprehensive Income (Loss) Before Reclassifications	432	(895)	2,139	(1,338)
Amounts Reclassified from AOCI	(43)	681	(139)	509
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	389	(214)	2,000	(829)
Related Tax Amounts	(82)	45	(420)	174
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	307	(169)	1,580	(655)
Accumulated Other Comprehensive Income (Loss), Balance at End of Period	$ 738	$ 231	$ 738	$ 231