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Net Income (Loss) Per Share Net Income (Loss) Per Share (Details 1) - USD ($) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 09, 2016 | Sep. 30, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Jun. 23, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock, Gross |  |  | $ 75,000,000 |  |  |  |
Stock Issued During Period, Shares, New Issues | 4,293,785 |  | 9,253,016 |  |  |  |
Proceeds from Issuance of Common Stock |  | $ 53,400,000 | $ 49,513,000 | $ 0 | $ 122,584,000 | $ 0 |
Payments for Commissions |  | $ 1,200,000 |  |  |  |  |
Stock Issued During Period, Price per Share |  | $ 8.11 | $ 8.11 |  | $ 8.11 |  |
Term Loan due 2020 [Member] | Secured Debt [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  | $ 100,000,000
Common Stock |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Sale of Stock, Authorized Amount | $ 200,000,000 |  |  |  |  |  |

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