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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jul. 03, 2018 | Aug. 09, 2017 | Nov. 07, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock shares authorized |  |  |  | 100,000,000 |  | 100,000,000 |  | 100,000,000
Common stock, par value |  |  |  | $ 0.01 |  | $ 0.01 |  | $ 0.01
Preferred stock shares authorized |  |  |  | 50,000,000 |  | 50,000,000 |  | 50,000,000
Preferred stock, par value |  |  |  | $ 0.01 |  | $ 0.01 |  | $ 0.01
Common stock shares issued |  |  |  | 30,758,852 |  | 30,758,852 |  | 29,502,624
Common stock shares outstanding |  |  |  | 30,758,852 |  | 30,758,852 |  | 29,502,624
Common stock shares issued related to vesting of restricted stock awards |  |  |  | 39,600 |  | 300,000 |  |
Net proceeds from issuances of common stock |  |  |  |  |  | $ 31,230 | $ 35,010 |
2017 Incentive Plan [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock shares for stock award, available for issuance |  |  |  | 1,000,000 |  | 1,000,000 |  |
First Distribution Agreement [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Aggregate offering price |  |  | $ 50,000 |  |  |  |  |
Second Distribution Agreement [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Aggregate offering price |  | $ 100,000 |  |  |  |  |  |
Net proceeds from issuances of common stock |  |  |  | $ 17,100 |  |  |  |
Third Distribution Agreement [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Aggregate offering price | $ 100,000 |  |  |  |  |  |  |
Second And Third Distribution Agreements [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock shares sold and issued |  |  |  | 600,000 |  | 1,100,000 |  |
Net proceeds from issuances of common stock |  |  |  | $ 17,100 |  | $ 31,700 |  |
Comissions and fees paid to Sales Agents |  |  |  | $ 300 |  | $ 600 |  |
First And Second Distribution Agreements [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock shares sold and issued |  |  |  |  | 400,000 |  | 1,400,000 |
Net proceeds from issuances of common stock |  |  |  |  | $ 10,000 |  | $ 34,600 |
Comissions and fees paid to Sales Agents |  |  |  |  | $ 200 |  | $ 700 |

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