Equity and Noncontrolling Interest - Reclassifications (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss), Balance at Beginning of Period	$ (78,881)	$ (74,351)	$ (80,715)	$ (65,100)
Other Comprehensive Income (Loss) Before Reclassifications	(27,538)	(6,448)	(26,292)	(17,498)
Amounts Reclassified from AOCI	632	687	1,957	2,758
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	(26,906)	(5,761)	(24,335)	(14,740)
Related Tax Amounts	(260)	(220)	(997)	(492)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(27,166)	(5,981)	(25,332)	(15,232)
Accumulated Other Comprehensive Income (Loss), Balance at End of Period	(106,047)	(80,332)	(106,047)	(80,332)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Balance at Beginning of Period	(50,296)	(42,069)	(49,322)	(31,893)
Other Comprehensive Income (Loss) Before Reclassifications	(28,211)	(6,821)	(29,185)	(16,997)
Amounts Reclassified from AOCI	0	0	0	0
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	(28,211)	(6,821)	(29,185)	(16,997)
Related Tax Amounts	0	0	0	0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(28,211)	(6,821)	(29,185)	(16,997)
Accumulated Other Comprehensive Income (Loss), Balance at End of Period	(78,507)	(48,890)	(78,507)	(48,890)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Balance at Beginning of Period	(29,323)	(32,513)	(30,551)	(34,093)
Other Comprehensive Income (Loss) Before Reclassifications	679	99	760	563
Amounts Reclassified from AOCI	728	756	2,192	2,318
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	1,407	855	2,952	2,881
Related Tax Amounts	(281)	(177)	(598)	(623)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	1,126	678	2,354	2,258
Accumulated Other Comprehensive Income (Loss), Balance at End of Period	(28,197)	(31,835)	(28,197)	(31,835)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Balance at Beginning of Period	738	231	(842)	886
Other Comprehensive Income (Loss) Before Reclassifications	(6)	274	2,133	(1,064)
Amounts Reclassified from AOCI	(96)	(69)	(235)	440
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	(102)	205	1,898	(624)
Related Tax Amounts	21	(43)	(399)	131
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(81)	162	1,499	(493)
Accumulated Other Comprehensive Income (Loss), Balance at End of Period	$ 657	$ 393	$ 657	$ 393