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Equity - Issuance of Common Stock (Details) - USD ($) $ in Thousands | 1 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Issuance of Common Stock |  |  |
Net proceeds from issuance of common shares |  | $ 0 | $ 704,938
Common stock |  |  |
Issuance of Common Stock |  |  |
Shares issued | 11,850,000 |  |
Underwriting discounts and offering costs | $ 29,800 |  |
Net proceeds from issuance of common shares | $ 704,900 |  |

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- Definition The cash outflow for cost incurred directly with the issuance of an equity security. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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