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Fair Value Measurements (Fair Value of Marketable Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value Measurements
Estimated fair value of marketable securities	$ 26,179	$ 25,706
Fair value, inputs, Level 1 [Member]
Fair Value Measurements
Estimated fair value of marketable securities	26,179	25,706
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

- 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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