Shareholders' Equity (Weighted Average Exercise Price And Fair Value Of Options Granted) (Details)	12 Months Ended
Dec. 31, 2015 $ / shares shares	Dec. 31, 2014 $ / shares	Dec. 31, 2013 $ / shares
Stockholders' Equity Note [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number \| shares	36,504
Weighted average exercise price per share, Less than market price	0.00	0.00	39.60
Weighted average fair value on grant date, Less than market price, per share	0.00	0.00	9.74

As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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

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