Shareholders' Equity (Issued Share Capital) (Details) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011 USD ($)	Dec. 31, 2011 CHF	Dec. 31, 2010 USD ($)	Dec. 31, 2010 CHF	Dec. 31, 2011 Parent Company [Member] USD ($)	Dec. 31, 2011 Parent Company [Member] CHF	Dec. 31, 2010 Parent Company [Member] USD ($)	Dec. 31, 2010 Parent Company [Member] CHF
Common shares issued and fully paid, 2011: CHF 14.03 per share and 2010: CHF 15.00 per share	40,003,642	40,003,642	40,003,642	40,003,642	40,003,642	40,003,642	40,003,642	40,003,642
Share capital at end of year	$ 557,153		$ 600,055		$ 557,153		$ 600,055
Common shares, par value		14.03		15		14.03		15.00