Income Taxes (Details 5)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Tax rates which are different than the Swiss and Cayman Island rates	18.90%	14.60%	17.30%
Reserve for (resolution of) tax authority audits	(2.20%)	1.00%	(0.60%)
Total	16.70%	15.60%	16.70%