Pension and Other Postretirement Benefit Plans (Changes in the pension benefit obligation and plan assets) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Change in benefit obligation:
Defined Benefit Plan, Plan Amendments	$ 83,000	$ 0
Changes in plan assets:
Funded status at end of year	5,849,000	7,362,000
Foreign Plan [Member]
Change in benefit obligation:
Benefit obligation at beginning of year	33,006,000	32,577,000
Service cost	958,000	846,000	$ 831,000
Interest cost	332,000	697,000	504,000
Plan participant contributions	523,000	593,000
Benefits paid	(3,064,000)	(3,018,000)
Actuarial loss	1,262,000	4,974,000
Effect of foreign currency translation	53,000	(3,663,000)
Projected benefit obligation at end of year	33,153,000	33,006,000	32,577,000
Changes in plan assets:
Fair value of plan assets at beginning of year	40,368,000	43,145,000
Actual return on plan assets	419,000	3,478,000
Company contributions	640,000	720,000	722,000
Plan participant contributions	523,000	593,000
Benefits paid	(3,064,000)	(3,018,000)
Effect of foreign currency translation	116,000	(4,550,000)
Fair value of plan assets at end of year	39,002,000	40,368,000	$ 43,145,000
Funded status at end of year	$ 5,849,000	$ 7,362,000