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Non-controlling Interests Non-controllin Interests (Details) - USD ($) $ 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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Noncontrolling Interest [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income attributable to common shareholders | $ 39,196 | $ 38,866 | $ 38,671 | $ 39,395 | $ 87,989 | $ 34,384 | $ 39,188 | $ 34,861 | $ 156,128 | $ 196,422 | $ 819,823

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