Employee Benefit Plans (Net Periodic Benefit Cost For U.S. Employees Related To Defined Benefit Pension Plans) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost	$ 10,874	$ 10,783	$ 10,772
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	7,548	6,944	6,015
Interest cost	7,702	7,052	6,385
Expected return on plan assets	(9,067)	(7,971)	(6,145)
Amortization of actuarial loss from earlier periods	3,367	2,467	3,663
Amortization of unrecognized prior service cost	49	49	49
Settlement	1,275	2,242	805
Net periodic benefit cost	10,874	10,783	10,772
Other comprehensive income (loss) attributable to change from prior year	42,487	2,462
Total recognized in net periodic benefit cost and other comprehensive income (loss)	$ 53,361	$ 13,244