Accumulated Other Comprehensive Income (Loss) (Components of OCI) (Details 1) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before tax		$ 21,399	$ 2,828
Other Comprehensive Income (Loss), income tax		(3,117)	407
Other Comprehensive Income (Loss), Net of Tax		18,282	3,235
Foreign Currency Translation Adjustment [Member]
Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax		13,668	3,845
Other Comprehensive Income (Loss) before Reclassifications, Tax		0	0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		13,668	3,845
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		0
Other Comprehensive Income (Loss), Net of Tax		13,668
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]
Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax		9,558	343
Other Comprehensive Income (Loss) before Reclassifications, Tax		(3,823)	(137)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		5,735	206
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		0	(1,754)
Reclassification from AOCI, Current Period, Tax		0	701
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		0	(1,053)
Other Comprehensive Income (Loss), before tax		9,558	(1,411)
Other Comprehensive Income (Loss), income tax		(3,823)	564
Other Comprehensive Income (Loss), Net of Tax		5,735	(847)
Pension and Other Postretirement Plans [Member]
Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		0
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		(1,703)	394
Reclassification from AOCI, Current Period, Tax		681	(157)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(1,022)	237
Other Comprehensive Income (Loss), before tax		(1,703)	394
Other Comprehensive Income (Loss), income tax		681	(157)
Other Comprehensive Income (Loss), Net of Tax		(1,022)	237
Net Prior Service Cost [Member]
Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[1]	120	104
Reclassification from AOCI, Current Period, Tax		(48)	(41)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		72	63
Net Actuarial (Gain) Loss [Member]
Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[1]	(1,823)	290
Reclassification from AOCI, Current Period, Tax		729	(116)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(1,094)	174
Cash Flow Hedge [Member]
Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		(124)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		25
Other Comprehensive Income (Loss), before tax		(124)	0
Other Comprehensive Income (Loss), income tax		25	0
Other Comprehensive Income (Loss), Net of Tax		$ (99)	$ 0

[1] These accumulated other comprehensive income components are included in the computation of net periodic pension and postretirement plan cost (see Note 8).