Employee Benefit Plans (Summary Of Status Of Plan) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	$ 14,616	$ 8,882	$ 10,259
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	9,370	7,548	6,944
Interest cost	7,971	7,702	7,052
Post-Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year	21,462	16,754
Service cost	1,677	1,165	1,017
Interest cost	1,033	934	849
Actuarial loss	4,136	2,930
Excise tax cost	11	53
Benefits paid	(381)	(374)
Projected benefit obligation at end of year	27,938	21,462	16,754
Fair value of plan assets at beginning of year
Actual contributions during the year	381	374
Fair value of plan assets at end of year
Funded status at end of year	(27,938)	(21,462)
U.S. Employees [Member] | Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year	175,364	138,392
Service cost	9,370	7,548
Interest cost	7,971	7,702
Actuarial loss	21,786	26,802
Benefits paid	(2,332)	(5,080)
Projected benefit obligation at end of year	212,159	175,364
Fair value of plan assets at beginning of year	101,304	114,470
Actual return on plan assets	15,568	(11,309)
Actual contributions during the year	267	3,223
Fair value of plan assets at end of year	114,807	101,304
Funded status at end of year	$ (97,352)	$ (74,060)