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Stock-based Compensation - Stock Option Activity (Details) - 2008 LTIP - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Stock-based compensation |  |  |  |
Shares authorized to be granted under stock compensation plan | 2,000,000 |  | 2,000,000 |
Shares available for future awards | 1,293,109 |  | 1,293,109 |
Stock Options |  |  |  |
Number Outstanding |  |  |  |
Outstanding at beginning of period (in shares) |  |  | 537,500 | 540,625
Granted during period (in shares) | 0 | 0 | 0 | 0
Exercised during period (in shares) |  |  | 0 | 0
Forfeited or expired during period (in shares) |  |  | 0 | 0
Outstanding at end of period (in shares) | 537,500 | 540,625 | 537,500 | 540,625
Exercisable at end of period (in shares) | 267,500 | 180,625 | 267,500 | 180,625
Weighted Average Exercise Price |  |  |  |
Outstanding at beginning of period (in dollars per share) |  |  | $ 2.19 | $ 2.18
Outstanding at end of period (in dollars per share) | $ 2.19 | $ 2.18 | 2.19 | 2.18
Exercisable at end of period (in dollars per share) | $ 2.71 | $ 3.29 | $ 2.71 | $ 3.29
Additional disclosures |  |  |  |
Stock based compensation expense (reversal of expense) | $ 10 | $ 10 | $ 29 | $ 29
Unrecognized compensation cost, options | $ 94 |  | $ 94 |
Period for recognizing unrecognized compensation cost |  |  | 2 years 4 months 24 days |

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- Definition The amount of expense, net of income tax, 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. + References No definition available. + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested options awarded to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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