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Stock Based Compensation (Notes) | 6 Months Ended
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Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock Based Compensation | (14) Stock-based compensation Our Board of Directors granted 912,790 stock options, 19,335 deferred stock units and 6,740 restricted stock units during the three months ended June 30, 2018 under our Omnibus Equity Incentive Plan. We recognized stock-based compensation expense of $0.2 million in the six months ended June 30, 2018. As of June 30, 2018, unrecognized compensation cost related to non-vested stock options, deferred stock units and restricted stock units represents $5.5 million, which will be recognized over the remaining weighted average life of 3 years. Stock options
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | Number of shares |  | Weighted- average Exercise Price |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding unvested as of January 1, 2018 |  |  | — |  |  | — |
Granted |  |  | 912,790 |  |  | 15.36 |
Forfeited |  |  | (11,070 | ) |  | 15.00 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding unvested as of June 30, 2018 |  |  | 901,720 |  |  | 15.36 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred stock units
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | Number of shares |  | Weighted- average grant date fair value |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding unvested as of January 1, 2018 |  |  | — |  |  | — |
Granted |  |  | 19,335 |  |  | 13.20 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding unvested as of June 30, 2018 |  |  | 19,335 |  |  | 13.20 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Restricted stock units
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | Number of shares |  | Weighted- average grant date fair value |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding unvested as of January 1, 2018 |  |  | — |  |  | — |
Granted |  |  | 6,740 |  |  | 14.02 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding unvested as of June 30, 2018 |  |  | 6,740 |  |  | 14.02 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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