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Net Income (Loss) Per Share Net Income (Loss) Per Share (Details 1) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jun. 23, 2015
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from Issuance of Common Stock, Gross | $ 75,000 | $ 200,000 |  |  |  |
Stock Issued During Period, Shares, New Issues | 9,253,016 | 17,691,094 |  |  |  |
Proceeds from Issuance of Common Stock |  |  | $ 269,556 | $ 0 | $ 0 |
Term Loan due 2020 [Member] | Secured Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt |  |  |  |  |  | $ 100,000

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