Share-Based Compensation (Share-based Compensation Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Cash received from stock option exercises	$ 358	$ 2,162	$ 1,632
Compensation cost, all share-based awards	145	60	142
Excess tax benefits related to share-based compensation	$ 4	$ 8	$ (913)

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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- Definition

Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

+ References

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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