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Unaudited Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 83,036 | $ 81,550 | $ 80,135 | $ 81,248 | $ 88,182 | $ 100,295 | $ 105,673 | $ 102,821 | $ 325,969 | $ 396,971 | $ 392,690
Net income (loss) | 85,423 | 147,821 | 23,769 | 28,280 | 25,674 | 220,850 | (795) | (14,823) | 285,293 | 230,906 | 86,629
Net income attributable to common shareholders | $ 83,574 | $ 141,560 | $ 21,721 | $ 26,405 | $ 23,796 | $ 216,190 | $ (3,327) | $ (15,957) | $ 273,225 | $ 220,838 | $ 79,067
Net income attributable to common shareholders - basic (usd per share) | $ 0.34 | $ 0.60 | $ 0.09 | $ 0.11 | $ 0.10 | $ 0.91 | $ (0.01) | $ (0.07) | $ 1.15 | $ 0.93 | $ 0.33
Net income (loss) attributable to common shareholders - per common share diluted (usd per share) | $ 0.33 | $ 0.59 | $ 0.09 | $ 0.11 | $ 0.10 | $ 0.90 | $ (0.01) | $ (0.07) | $ 1.15 | $ 0.93 | $ 0.33

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