The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently 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 (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

+ References

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=96867065&loc=d3e5070-113901

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- Definition

Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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Equity Incentive Plans (Summary Of Exercisable Options) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 0	$ 0	$ 0	$ 0
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 0	$ 0	$ 0	$ 0
Options outstanding (in shares)	226,576		226,576
Weighted avg. life remaining (in years)			4 years 7 months
Weighted avg. exercise price	$ 50.61		$ 50.61
Aggregate intrinsic value	$ 4,037		$ 4,037
Exercise Price Range Nineteen Point Two to Nineteen Point Nine Nine [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit			$ 19.02
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit			$ 19.99
Options outstanding (in shares)	11,097		11,097
Weighted avg. life remaining (in years)			7 months
Twenty To Twenty Nine Point Nine Nine Member
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit			$ 20.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit			29.99
Thirty To Thirty Nine Point Nine Nine Member
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit			30.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit			$ 39.99
Options outstanding (in shares)	1,428		1,428
Weighted avg. life remaining (in years)			1 year 3 months
Forty To Forty Nine Point Nine Nine Member
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit			$ 40.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit			$ 49.99
Options outstanding (in shares)	84,509		84,509
Weighted avg. life remaining (in years)			3 years 3 months
Fifty To Fifty Nine Point Nine Nine Member
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit			$ 50.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit			$ 59.99
Options outstanding (in shares)	71,798		71,798
Weighted avg. life remaining (in years)			5 years 3 months
Sixty To Sixty Five Point Five Zero Member
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit			$ 60.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit			$ 69.99
Options outstanding (in shares)	57,190		57,190
Weighted avg. life remaining (in years)			6 years 5 months
Seventy To Seventy Six Point Six Three [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit			$ 70.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit			$ 76.63
Options outstanding (in shares)	554		554
Weighted avg. life remaining (in years)			8 years 5 months