Pension And Other Postretirement Benefit Plans (Schedule Of Change In Benefit Obligations And Plan Assets Of Pension Plans And Funded Status And Other Postretirement Benefits) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010		Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	$ 2,080,000	$ 3,269,000		$ 4,173,000
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year	3,313,000	4,267,000
Service cost		(898,000)	[1]
Interest cost	158,000	225,000		254,000
Actuarial gain	(69,000)	(30,000)
Benefits paid	(89,000)	(251,000)
Benefit obligation at end of year	3,313,000	3,313,000		4,267,000
Funded status	3,313,000	3,313,000
Accrued postretirement obligation	3,313,000	3,313,000
Net amount recognized	(3,313,000)	(3,313,000)
U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year	227,207,000	198,617,000
Service cost		(159,000)
Interest cost	12,099,000	11,762,000
Special termination benefits		139,000
Plan participants' contributions	1,826,000	1,746,000
Actuarial gain	28,875,000	23,176,000
Benefits paid	(8,752,000)	(8,074,000)
Benefit obligation at end of year	261,255,000	227,207,000
Fair value of plan assets at beginning of year	134,807,000	123,435,000
Actual return on plan assets	9,470,000	14,164,000
Employer contributions	5,548,000	3,536,000
Fair value of plan assets at end of year	142,899,000	134,807,000
Funded status	(118,356,000)	(92,400,000)
Net amount recognized	(118,356,000)	(92,400,000)
U.S. [Member] | Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		(159,000)		1,018,000
Interest cost	12,099,000	11,762,000		11,795,000
Plan participants' contributions		(34,000)		(116,000)
Actuarial gain	2,252,000	891,000		25,000
Curtailment gain				722,000
Net amount recognized	(118,356,000)	(92,400,000)
Non-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year	45,683,000	45,846,000
Service cost	172,000
Interest cost	2,292,000	2,144,000
Plan participants' contributions	58,000
Actuarial gain	2,172,000	1,494,000
Benefits paid	(2,779,000)	(2,756,000)
Foreign currency translation adjustment	1,291,000	(1,045,000)
Benefit obligation at end of year	48,889,000	45,683,000
Fair value of plan assets at beginning of year	41,380,000	39,601,000
Actual return on plan assets	1,096,000	3,663,000
Employer contributions	1,233,000	2,070,000
Foreign currency translation adjustment	1,366,000	(1,198,000)
Fair value of plan assets at end of year	42,354,000	41,380,000
Funded status	(6,535,000)	(4,303,000)
Net amount recognized	(6,535,000)	(4,303,000)
Non-U.S. [Member] | Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost				296,000
Interest cost	2,191,000	2,144,000		1,846,000
Actuarial gain	675,000	536,000		37,000
Net amount recognized	$ (6,536,000)	$ (4,303,000)

[1] Effective during the year ended December 31, 2010, an amendment to eliminate coverage for a retiree group and subsidy on prescription drugs costs resulted in an unrecognized prior service cost.