Shareholders' Equity (Issued Share Capital) (Details) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014 USD ($)	Dec. 31, 2014 CHF	Dec. 31, 2013 USD ($)	Dec. 31, 2013 CHF	Dec. 31, 2012
Stockholders' Equity Note [Abstract]
Common shares issued and fully paid, 2014 and 2013: CHF 4.10 per share	100,775,256us-gaap_CommonStockSharesIssued	100,775,256us-gaap_CommonStockSharesIssued	103,477,452us-gaap_CommonStockSharesIssued	103,477,452us-gaap_CommonStockSharesIssued	109,109,604us-gaap_CommonStockSharesIssued
Common shares, par value		4.1		4.1
Total share capital	$ 408,020us-gaap_CommonStockValue		$ 418,988us-gaap_CommonStockValue

Face amount or stated value per share of common stock.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 30

-Article 5

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- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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- Definition

Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.

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