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Equity - Cash Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend declared per common stock (usd per share) | $ 0.132 | $ 0.132 | $ 0.12 | $ 0.1200 | $ 0.1200 | $ 0.1200 | $ 0.12 | $ 0.1200 | $ 0.1200 | $ 0.095 | $ 0.095 | $ 0.1875 | $ 0.5040 | $ 0.4800 | $ 0.4975
Total Dividends | $ 17,156 | $ 17,114 | $ 15,486 | $ 8,532 | $ 8,536 | $ 8,536 | $ 8,534 | $ 8,458 | $ 8,459 | $ 6,698 | $ 6,711 | $ 13,052 | $ 58,288 | $ 34,063 | $ 34,921

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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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