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Capital Stock - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 6 Months Ended
--- | --- | --- | --- | ---
Mar. 02, 2016 | Feb. 26, 2016 | Feb. 22, 2016 | Jun. 30, 2016 | Jun. 30, 2015
Equity [Abstract] |  |  |  |  |
Shares issued during period (in shares) | 6,600,000.0 |  | 44,000,000 |  |
Price of share sold (in USD per share) |  |  | $ 19.675 |  |
Sale of common stock, net | $ 129,900 | $ 865,700 |  | $ 995,279 | $ 0

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