Stock Based Compensation Restricted Stock Units Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Weighted Average Grant Date Fair Value
Amount Expensed During the Year	$ 356	$ 351	$ 287
Restricted Stock Units (RSUs)
Restricted Stock Units
Beginning balance, nonvested (in shares)	0
Granted (in shares)	3,377
Vested (in shares)	0
Canceled (in shares)	0
Ending balance, nonvested (in shares)	3,377	0
Weighted Average Grant Date Fair Value
Beginning balance, nonvested (in usd per share)	$ 0.00
Granted (in usd per share)	32.57
Vested (in usd per share)	0.00
Canceled (in usd per share)	0.00
Ending balance, nonvested (in usd per share)	$ 32.57	$ 0.00
Amount Expensed During the Year	$ 34
Compensation Costs for Non-vested Awards Not Yet Recognized	$ 76

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based compensation awards.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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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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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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