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Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Data [Abstract]
Total revenue	$ 16,660	$ 15,913	$ 16,218	$ 18,902	$ 16,703	$ 16,181	$ 17,194	$ 21,576	$ 67,693	$ 71,654	$ 95,919
Operating income	217	593	414	343	967	1,823	1,873	3,767	1,567	8,430	15,147
Net income	$ 18,702	$ 522	$ 375	$ 252	$ 1,160	$ 1,509	$ 1,259	$ 2,541	$ 19,851	$ 6,469	$ 10,147
Net income per share - Basic (in dollars per share)	$ 1.46	$ 0.04	$ 0.03	$ 0.02	$ 0.09	$ 0.12	$ 0.10	$ 0.20	$ 1.55	$ 0.51	$ 0.81
Net income per share - Diluted (in dollars per share)	$ 1.42	$ 0.04	$ 0.03	$ 0.02	$ 0.09	$ 0.12	$ 0.10	$ 0.20	$ 1.51	$ 0.50	$ 0.79

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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