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Fair Value Measurements (Fair Value of Marketable Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value Measurements |  |
Estimated fair value of marketable securities | $ 25,706 | $ 20,462
Fair value, inputs, Level 1 [Member] |  |
Fair Value Measurements |  |
Estimated fair value of marketable securities | 25,706 | 20,462
Fair value, inputs, Level 2 [Member] |  |
Fair Value Measurements |  |
Estimated fair value of marketable securities | 0 | 0
Fair value, inputs, Level 3 [Member] |  |
Fair Value Measurements |  |
Estimated fair value of marketable securities | $ 0 | $ 0

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