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Long-Term Compensation Plan and Stock Based Compensation - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018
Restricted Stock, subject to performance criteria |  |  |
Long-Term Compensation Plan and Stock Based Compensation |  |  |
Unissued shares | 161,000 | 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 |
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 |  |  | 324
2009 Equity Incentive Plan | Restricted Stock, subject to performance criteria |  |  |
Long-Term Compensation Plan and Stock Based Compensation |  |  |
Unissued shares | 161,000 | 161,000 |
Vesting period (in years) |  | 3 years |
Fair value of nonvested awards |  | $ 2,280 |
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 |  | 163,000 |
Restricted stock awards, fair value |  | $ 2,299 |
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 |
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 |

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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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- Definition Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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