Nonpension Postretirement Benefits (Change in Accumulated Benefit Obligation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Nonpension Postretirement Benefit Plans
Change in projected benefit obligation:
Benefit obligation, beginning of year	$ 68,101	$ 63,823
Service Cost	856	1,008	$ 1,192
Interest cost	2,589	2,948	2,732
Plan participants' contributions	610	699
Actuarial (gain) loss	(8,027)	5,495
Exchange rate fluctuations	(346)	(219)
Benefits paid	(3,598)	(5,653)
Benefit obligation, end of year	60,185	68,101	63,823
Funded status and accrued benefit cost	(60,185)	(68,101)
U.S. Plans
Change in projected benefit obligation:
Benefit obligation, beginning of year	65,565	61,117
Service Cost	855	1,007	1,190
Interest cost	2,537	2,840	2,622
Plan participants' contributions	610	699
Actuarial (gain) loss	(7,287)	5,466
Exchange rate fluctuations	0	0
Benefits paid	(3,485)	(5,564)
Benefit obligation, end of year	58,795	65,565	61,117
Funded status and accrued benefit cost	(58,795)	(65,565)
Non-U.S. Plans
Change in projected benefit obligation:
Benefit obligation, beginning of year	2,536	2,706
Service Cost	1	1	2
Interest cost	52	108	110
Plan participants' contributions	0	0
Actuarial (gain) loss	(740)	29
Exchange rate fluctuations	(346)	(219)
Benefits paid	(113)	(89)
Benefit obligation, end of year	1,390	2,536	$ 2,706
Funded status and accrued benefit cost	$ (1,390)	$ (2,536)