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Investments - Schedule of Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Investments schedule [Line Items]
Investments, at fair value	$ 7,486	$ 6,756
Rabbi Trust Associated With Deferred Compensation Plan [Member]
Investments schedule [Line Items]
Investments, at fair value	7,465	6,734
Equity Securities [Member]
Investments schedule [Line Items]
Investments, at fair value	$ 21	$ 22

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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