Pension and Other Postretirement Benefits (Details 5) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Accrued liabilities	$ 8,261	$ 8,444
Accrued retirement benefits	109,350	112,888
Defined benefit pension plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Other assets	3,017	12,950
Accrued liabilities	3,180	3,185
Accrued retirement benefits	76,877	75,418
Accumulated other non-owner changes to equity, net	(110,988)	(99,826)
Net actuarial loss	(109,594)	(99,642)
Prior service costs	(1,394)	(184)
Defined benefit pension plans, U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Other assets	0	8,389
Accrued liabilities	2,813	2,806
Accrued retirement benefits	55,540	64,383
Accumulated other non-owner changes to equity, net	(91,530)	(83,014)
Net actuarial loss	(89,772)	(82,643)
Prior service costs	(1,758)	(371)
Defined benefit pension plans, Non-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Other assets	3,017	4,561
Accrued liabilities	367	379
Accrued retirement benefits	21,337	11,035
Accumulated other non-owner changes to equity, net	(19,458)	(16,812)
Net actuarial loss	(19,822)	(16,999)
Prior service costs	364	187
Other postretirement benefit plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Accrued liabilities	5,081	5,259
Accrued retirement benefits	31,772	36,447
Accumulated other non-owner changes to equity, net	(3,582)	(5,877)
Net actuarial loss	(3,532)	(6,061)
Prior service costs	$ (50)	$ 184