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Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 6 Months Ended
--- | --- | ---
Feb. 02, 2016 | Jun. 30, 2016 | Jun. 30, 2015
Class of Stock [Line Items] |  |  |
Shares issued, price per share (in usd per share) | $ 4.685 |  |
Net proceeds from offering |  | $ 182,953 | $ 463,010
Common Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Issuance of common stock (in shares) |  | 39,100,000 |
Net proceeds from offering |  | $ 400 |
Additional Paid-in-Capital [Member] |  |  |
Class of Stock [Line Items] |  |  |
Net proceeds from offering |  | $ 182,600 |
Common Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Issuance of common stock (in shares) | 39,100,000 |  |
Common Stock [Member] | Over-Allotment Option [Member] |  |  |
Class of Stock [Line Items] |  |  |
Issuance of common stock (in shares) | 5,100,000 |  |

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