Employee Benefit Plans (Incurred Expenses Related To Defined Contribution Plans For U.S. Employees) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Employee Benefit Plans [Abstract]
Incurred expenses	$ 2,062	$ 1,801	$ 1,631