Employee Benefit Plans (Summary Of Status Of Plan) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	$ 19,921	$ 14,616	$ 8,882
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	11,182	9,370	7,548
Interest cost	8,511	7,971	7,702
Post-Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year	27,938	21,462
Service cost	1,899	1,677	1,165
Interest cost	1,164	1,033	934
Actuarial (gain)/loss	(3,040)	4,136
Excise tax cost		11
Benefits paid	(366)	(381)
Projected benefit obligation at end of year	27,594	27,938	21,462
Fair value of plan assets at beginning of year
Actual contributions during the year	366	381
Fair value of plan assets at end of year
Funded status at end of year	(27,594)	(27,938)
U.S. Employees [Member] | Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year	212,159	175,364
Service cost	11,182	9,370
Interest cost	8,511	7,971
Actuarial (gain)/loss	(12,742)	21,786
Benefits paid	(5,052)	(2,332)
Projected benefit obligation at end of year	214,059	212,159
Fair value of plan assets at beginning of year	114,807	101,304
Actual return on plan assets	20,155	15,568
Actual contributions during the year	22,536	267
Fair value of plan assets at end of year	152,446	114,807
Funded status at end of year	$ (61,613)	$ (97,352)