Equity and Noncontrolling Interest - Reclassifications (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accumulated Other Comprehensive Loss, Balance at Beginning of Period	$ (81,961)	$ (68,002)	$ (87,407)	$ (73,316)
Other Comprehensive Income (Loss) Before Reclassifications	7,758	(4,029)	13,010	357
Amounts Reclassified from AOCI	2,375	720	2,865	2,016
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	10,133	(3,309)	15,875	2,373
Related Tax Amounts	(1,110)	(479)	(1,406)	(847)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	9,023	(3,788)	14,469	1,526
Accumulated Other Comprehensive Loss, Balance at End of Period	(72,938)	(71,790)	(72,938)	(71,790)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Loss, Balance at Beginning of Period	(47,327)	(33,873)	(52,255)	(38,544)
Other Comprehensive Income (Loss) Before Reclassifications	7,265	(4,939)	12,193	(268)
Amounts Reclassified from AOCI	0	0	0	0
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	7,265	(4,939)	12,193	(268)
Related Tax Amounts	0	0	0	0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	7,265	(4,939)	12,193	(268)
Accumulated Other Comprehensive Loss, Balance at End of Period	(40,062)	(38,812)	(40,062)	(38,812)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Loss, Balance at Beginning of Period	(35,850)	(35,064)	(36,168)	(35,251)
Other Comprehensive Income (Loss) Before Reclassifications	268	590	(73)	113
Amounts Reclassified from AOCI	2,650	802	3,500	1,600
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	2,918	1,392	3,427	1,713
Related Tax Amounts	(1,127)	(398)	(1,318)	(532)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	1,791	994	2,109	1,181
Accumulated Other Comprehensive Loss, Balance at End of Period	(34,059)	(34,070)	(34,059)	(34,070)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Loss, Balance at Beginning of Period	1,216	935	1,016	479
Other Comprehensive Income (Loss) Before Reclassifications	225	320	890	512
Amounts Reclassified from AOCI	(275)	(82)	(635)	416
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	(50)	238	255	928
Related Tax Amounts	17	(81)	(88)	(315)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(33)	157	167	613
Accumulated Other Comprehensive Loss, Balance at End of Period	$ 1,183	$ 1,092	$ 1,183	$ 1,092