Accounting Policies (Schedule of Foreign Currency Transaction Gains and Losses) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Accounting Policies [Abstract]
Selling and general expenses	$ (2,675)	$ (377)	$ 2,715
Other (income)/expense, net	(84)	(4,626)	(2,253)
Total transaction (gains)/losses	$ (2,759)	$ (5,003)	$ 462