Shareholders' Equity (Schedule Of Dividends Paid) (Details) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended			0 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Oct. 02, 2014 Common shares USD ($)	Jul. 02, 2014 Common shares USD ($)	Apr. 03, 2014 Common shares USD ($)	Jan. 02, 2014 Common shares USD ($)	Oct. 03, 2013 Common shares USD ($)	Jul. 03, 2013 Common shares USD ($)	Mar. 12, 2013 Common shares Par Value Reduction USD ($)	Mar. 12, 2013 Common shares Par Value Reduction CHF	Dec. 18, 2012 Common shares Par Value Reduction USD ($)	Dec. 18, 2012 Common shares Par Value Reduction CHF	Sep. 25, 2012 Common shares Par Value Reduction USD ($)	Sep. 25, 2012 Common shares Par Value Reduction CHF	Aug. 06, 2012 Common shares Par Value Reduction USD ($)	Aug. 06, 2012 Common shares Par Value Reduction CHF	Apr. 06, 2012 Common shares Par Value Reduction USD ($)	Apr. 06, 2012 Common shares Par Value Reduction CHF	Jan. 06, 2012 Common shares Par Value Reduction USD ($)	Jan. 06, 2012 Common shares Par Value Reduction CHF
Dividends, Common Stock [Abstract]
Dividends paid per common share	$ 0.784	$ 0.458	$ 0.625	$ 0.225	$ 0.225	$ 0.167	$ 0.167	$ 0.167	$ 0.167	$ 0.125	0.11	$ 0.125	0.11	$ 0.125	0.12	$ 0.125	0.12	$ 0.125	0.11	$ 0.125	0.12
Payment of quarterly dividends				$ 21,686	$ 21,870	$ 16,495	$ 16,732	$ 16,952	$ 17,117	$ 12,981		$ 13,010		$ 13,324		$ 13,394		$ 13,795		$ 14,302