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Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 6 Months Ended
--- | --- | ---
Mar. 09, 2015 | Jun. 30, 2015 | Jun. 30, 2014
Class of Stock [Line Items] |  |  |
Shares issued, price per share | $ 12.80 |  |
Proceeds from sale of common stock | $ 463,100 | $ 463,010 | $ 0
Common Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Issuance of common stock, shares | 36,800,000 |  |
Additional Paid-in-Capital [Member] |  |  |
Class of Stock [Line Items] |  |  |
Proceeds from sale of common stock | $ 462,700 |  |
Common Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Issuance of common stock, shares |  | 36,800,000 |
Proceeds from sale of common stock | $ 400 |  |
Over-Allotment Option [Member] | Common Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Issuance of common stock, shares | 4,800,000 |  |

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