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Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Compensation expense	$ 4,261	$ 3,363	$ 2,509
Employee Stock
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Discount form market price	15.00%
Period for discount from market price	6 months
Maximum employee subscription rate	10.00%
Compensation expense for employee stock purchase plan	$ 925	$ 967	$ 846
Shares available for grant (in shares)	387,498
Shares subject to purchase (in shares)	45,184

X

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Period for Discount from Market Price

+ References

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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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- Definition

Amount of cost for defined contribution plan.

+ References

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-Publisher FASB
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-Topic 715
-SubTopic 70
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Discount rate from fair value on offering date that participants pay for shares.

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- Definition

The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The number of shares purchased on the open market during the period for issuance to employees under the plan.

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Amount of capitalized and expensed compensation cost from equity-based compensation arrangements.

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