Shareholders' Equity (Issued Share Capital) (Details) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012 USD ($)	Dec. 31, 2012 CHF	Dec. 31, 2011 USD ($)	Dec. 31, 2011 CHF
Shareholders' Equity [Abstract]
Common shares, issued	36,369,868	36,369,868	40,003,642	40,003,642
Common shares, par value		12.64		14.03
Common stock value	$ 454,980		$ 557,153