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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Unrecognized cost of unvested options awarded to employees as compensation.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

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

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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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No definition available.

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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, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted (in shares)	59,333	73,716	109,750
Stock-based compensation expense	$ 2,956	$ 2,270	$ 1,903
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
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)	59,333	53,770	61,235
Stock-based compensation expense	$ 2,600	$ 1,800	$ 1,400
Period for recognition - unrecognized compensation cost (in shares)	4 years 2 months
Average grant date fair value (in dollars per share)	$ 79.51	$ 76.93	$ 56.29
Unrecognized compensation cost - RSUs	$ 12,700
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted (in shares)		19,946	48,515
Stock options and SARs granted (in shares)	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	$ 367	$ 476	$ 509
Unrecognized compensation cost - options	$ 1,000
Period for recognition - unrecognized compensation cost (in shares)	3 years 8 months
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