Equity and Noncontrolling Interest - AOCI Reclassifications (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	$ (73,316)	$ (54,406)	$ (34,700)
Other Comprehensive (Loss) Income, before Reclassifications, before Tax	(17,106)	(20,025)	(22,639)
Amounts Reclassed from AOCI	3,058	3,010	798
Related Tax Amounts	(43)	(1,895)	2,135
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(87,407)	(73,316)	(54,406)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	(38,544)	(14,312)	1,152
Other Comprehensive (Loss) Income, before Reclassifications, before Tax	(13,711)	(24,232)	(15,464)
Amounts Reclassed from AOCI	0	0	0
Related Tax Amounts	0	0	0
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(52,255)	(38,544)	(14,312)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	(35,251)	(41,551)	(37,433)
Other Comprehensive (Loss) Income, before Reclassifications, before Tax	(4,229)	5,057	(9,232)
Amounts Reclassed from AOCI	3,075	3,642	3,043
Related Tax Amounts	237	(2,399)	2,071
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(36,168)	(35,251)	(41,551)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	479	1,457	1,581
Other Comprehensive (Loss) Income, before Reclassifications, before Tax	834	(850)	2,057
Amounts Reclassed from AOCI	(17)	(632)	(2,245)
Related Tax Amounts	(280)	504	64
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	$ 1,016	$ 479	$ 1,457