Accounting Policies (Schedule of Foreign Currency Transaction Gains and Losses) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]
Selling, general, and administrative expenses	$ (3,931)	$ 341	$ 1,642
Other expense/(income), net	(6,379)	5,227	5,708
Total transaction (gains)/losses	$ (10,310)	$ 5,568	$ 7,350