Pension and Other Postretirement Benefits (Details 5) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Accrued liabilities	$ 8,444	$ 8,233
Accrued retirement benefits	112,888	115,057
Defined benefit pension plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Other assets	12,950	14,502
Accrued liabilities	3,185	3,186
Accrued retirement benefits	75,418	72,013
Accumulated other non-owner changes to equity, net	(99,826)	(107,614)
Net actuarial loss	(99,642)	(106,805)
Prior service costs	(184)	(809)
Defined benefit pension plans, U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Other assets	8,389	10,620
Accrued liabilities	2,806	2,810
Accrued retirement benefits	64,383	59,952
Accumulated other non-owner changes to equity, net	(83,014)	(86,925)
Net actuarial loss	(82,643)	(86,399)
Prior service costs	(371)	(526)
Defined benefit pension plans, Non-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Other assets	4,561	3,882
Accrued liabilities	379	376
Accrued retirement benefits	11,035	12,061
Accumulated other non-owner changes to equity, net	(16,812)	(20,689)
Net actuarial loss	(16,999)	(20,406)
Prior service costs	187	(283)
Other postretirement benefit plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Accrued liabilities	5,259	5,047
Accrued retirement benefits	36,447	41,767
Accumulated other non-owner changes to equity, net	(5,877)	(7,675)
Net actuarial loss	(6,061)	(8,212)
Prior service costs	$ 184	$ 537