Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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Net number of non-option equity instruments granted to participants.

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Net number of share options (or share units) granted during the period.

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Gross number of share options (or share units) granted during the period.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Stock Plans and Stock Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted (in shares)	65,785	59,333	73,716
Stock-based compensation expense	$ 3,477	$ 2,956	$ 2,270
2009 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized number of awards (in shares)	1,602,000
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted during period (in shares)	0	0
Employee Stock Option \| 2009 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award term (no more than)	10 years
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted (in shares)	65,785	59,333	53,770
Stock-based compensation expense	$ 3,200	$ 2,600	$ 1,800
Period for recognition - unrecognized compensation cost (in shares)	3 years 9 months 15 days
Average grant date fair value (in dollars per share)	$ 75.44	$ 79.51	$ 76.93
Unrecognized compensation cost - RSUs	$ 13,300
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted (in shares)			19,946
Stock options and SARs granted (in shares)	0	0
Stock Appreciation Rights (SARs) \| 2009 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award term (no more than)	10 years
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 304	$ 367	$ 476
Unrecognized compensation cost - options	$ 600
Period for recognition - unrecognized compensation cost (in shares)	3 years
Minimum \| Employee Stock Option \| 2009 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	1 year
Minimum \| Restricted Stock \| 2009 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	5 years
Minimum \| Stock Appreciation Rights (SARs) \| 2009 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	1 year
Maximum \| Employee Stock Option \| 2009 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	7 years
Maximum \| Restricted Stock \| 2009 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	7 years
Maximum \| Stock Appreciation Rights (SARs) \| 2009 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	7 years