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Stock Based Compensation - Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
May 31, 2017 | May 31, 2015 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Director |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares issued, aggregate (in shares) |  |  |  |  | 265,934 |
Performance Share Awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  | 3 years |  |  |  |
Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Non-vested shares (in shares) |  |  | 464,880 | 528,846 | 422,928 | 319,058
Shares granted (in shares) |  |  | 206,597 | 326,663 |  |
Employee Stock Option |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares issued, aggregate (in shares) |  |  | 1,101,798 |  | 895,201 |
PSA Award | Performance Share Awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Maximum number of shares that may be issued (in shares) |  |  | 94,043 |  |  |
2017 Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Maximum number of shares that may be issued (in shares) |  |  | 5,570,000 |  |  |
Shares available for grant (in shares) |  |  | 5,298,225 |  |  |
2017 Incentive Plan | Director |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares issued (in shares) |  |  | 58,920 |  |  |
2017 Incentive Plan | Employee |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares issued (in shares) |  |  | 212,855 |  |  |
2017 Incentive Plan | Performance Share Awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Maximum number of shares that may be issued (in shares) | 588,535 |  |  |  |  |
Share-based compensation expense |  |  | $ 37,200 |  |  |
Unrecognized compensation cost |  |  | $ 2,300,000 |  |  |
Fair value of shares granted | $ 2,400,000 |  |  |  |  |
Award vesting period | 3 years |  |  |  |  |
2017 Incentive Plan | Performance Share Awards | Relative TSR performance Is Less Than The Thirtieth Percentile |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights, percentage | 0.00% |  |  |  |  |
2017 Incentive Plan | Performance Share Awards | Relative TSR Performance Is Equal To The Fiftieth Percentile |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights, percentage | 100.00% |  |  |  |  |
2017 Incentive Plan | Performance Share Awards | Board of Directors Chairman |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Fair value, expected term | 3 years |  |  |  |  |
Fair value, expected term for volatility rate | 3 years |  |  |  |  |
2017 Incentive Plan | Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Non-vested shares (in shares) |  |  | 212,855 |  |  |
2010 Stock Incentive Plan | Performance Share Awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation expense |  |  | $ 31,300 |  |  |
Unrecognized compensation cost |  |  | 10,400 |  |  |
2010 Stock Incentive Plan | Performance Share Awards | Board of Directors Chairman |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares granted (in shares) |  | 89,629 |  |  |  |
Fair value of shares granted |  | $ 400,000 |  |  |  |
Percentage of target PSA's granted eligible for receipt, minimum |  | 0.00% |  |  |  |
Percentage of target PSA's granted eligible for receipt, maximum |  | 200.00% |  |  |  |
Award vesting period | 3 years | 3 years |  |  |  |
Award vesting threshold, percentage |  | 0.33 |  |  |  |
Fair value, expected term |  | 3 years |  |  |  |
Fair value, expected term for volatility rate |  | 3 years |  |  |  |
Fair value, expected term for risk free interest rate |  | 3 years |  |  |  |
Fair value, expected term for dividend rate |  | 3 years |  |  |  |
2010 Stock Incentive Plan | Performance Share Awards | Board of Directors Chairman | If TSR is Less Than 33% |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights, percentage |  | 0.00% |  |  |  |
2010 Stock Incentive Plan | Performance Share Awards | Board of Directors Chairman | If TSR is Greater Than or Equal to 33% |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights, percentage |  | 100.00% |  |  |  |
2010 Stock Incentive Plan | Performance Share Awards | Board of Directors Chairman | If TSR is Greater Than or Equal to 33% and TSR Is In Top Quartile of Identified Peer Group |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights, percentage |  | 200.00% |  |  |  |
2010 Stock Incentive Plan | Performance Share Awards | Board of Directors Chairman | If TSR Is Greater Than or Equal to 33% and TSR Is In Bottom Quartile of Identified Peer Group |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights, percentage |  | 50.00% |  |  |  |
2010 Stock Incentive Plan | Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation expense |  |  | $ 300,000 |  |  |
Forfeitures (in shares) |  |  | 0 | 0 |  |
Unrecognized compensation cost |  |  | $ 2,400,000 |  | $ 3,000,000 |
Unrecognized compensation cost, period for recognition |  |  | 2 years 120 days |  |  |
Fair value of vested shares |  |  | $ 900,000 | $ 800,000 |  |
Requisite service period |  |  | 3 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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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event. + 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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