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Long-Term Compensation Plan and Stock Based Compensation - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended
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Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018
Long-Term Compensation Plan and Stock Based Compensation |  |  |
Unissued shares | 35,000 |  |
Restricted Stock, subject to performance criteria |  |  |
Long-Term Compensation Plan and Stock Based Compensation |  |  |
Unissued shares |  |  | 161,000
Restricted Stock, subject to time-based criteria |  |  |
Long-Term Compensation Plan and Stock Based Compensation |  |  |
Stock based compensation awards issued shares |  |  | 163,000
Unissued shares | 34,000 |  |
2009 Equity Incentive Plan |  |  |
Long-Term Compensation Plan and Stock Based Compensation |  |  |
Stock based compensation awards issued shares | 0 |  |
2009 Equity Incentive Plan | Restricted Stock |  |  |
Long-Term Compensation Plan and Stock Based Compensation |  |  |
Stock based compensation Awards | 69 |  | 324
Stock issues during the period |  | 0 |
2009 Equity Incentive Plan | Restricted Stock, subject to performance criteria |  |  |
Long-Term Compensation Plan and Stock Based Compensation |  |  |
Unissued shares | 35,000 |  | 161,000
Vesting period (in years) | 3 years |  | 3 years
Fair value of nonvested awards | $ 0.6 |  | $ 2.3
2009 Equity Incentive Plan | Restricted Stock, subject to time-based criteria |  |  |
Long-Term Compensation Plan and Stock Based Compensation |  |  |
Stock based compensation awards issued shares | 34,000 |  | 163,000
Restricted stock awards, fair value | $ 0.6 |  | $ 2.3
2009 Equity Incentive Plan | Restricted Stock, subject to time-based criteria | Minimum |  |  |
Long-Term Compensation Plan and Stock Based Compensation |  |  |
Vesting period (in years) | 1 year |  | 1 year
2009 Equity Incentive Plan | Restricted Stock, subject to time-based criteria | Maximum |  |  |
Long-Term Compensation Plan and Stock Based Compensation |  |  |
Vesting period (in years) | 4 years |  | 4 years

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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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