Shareholders' Equity (Equity Based Compensation Plans) (Details) shares in Thousands	12 Months Ended
Dec. 31, 2016 shares
Equity [Abstract]
Shares available for future grants (in thousands)	16,627
Vesting period, awards granted prior to 2010, years	5 years
Vesting period, awards granted after 2009 (minimum years)	1 year
Vesting period, awards granted after 2009 (maximum years)	5 years
Option term (in years)	10 years

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant