Pension and Post-Retirement Benefit Costs (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
United States Pension Plan of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1	$ 84	$ 29	$ 167
Interest cost	489	576	1,032	1,170
Expected return on plan assets	(705)	(777)	(1,524)	(1,586)
Amortization of prior service cost	0	74	0	148
Amortization of net loss	318	70	609	134
Net periodic benefit cost	(103)	(27)	(146)	(33)
Foreign Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	414		835
Interest cost	525		1,061
Expected return on plan assets	0		0
Amortization of prior service cost	0		0
Amortization of net loss	261		526
Net periodic benefit cost	(1,200)		(2,422)
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	5	11	11
Interest cost	149	181	299	362
Amortization of prior service cost	0	13	0	25
Amortization of net loss	96	69	192	138
Net periodic benefit cost	$ (251)	$ (268)	$ (502)	$ (536)