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Unaudited Quarterly Financial Data (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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 87,251 | $ 99,958 | $ 105,493 | $ 102,637 | $ 102,169 | $ 97,689 | $ 95,684 | $ 96,099 | $ 395,339 | $ 391,641 | $ 429,496
Net income | 25,674 | 220,850 | (795) | (14,823) | 31,448 | 5,596 | 7,365 | 42,220 | 230,906 | 86,629 | 96,450
Net income (loss) attributable to common shareholders | $ 23,796 | $ 216,190 | $ (3,327) | $ (15,957) | $ 29,235 | $ 3,916 | $ 5,519 | $ 40,397 | $ 227,415 | $ 85,583 | $ 95,624
Net income attributable to common shareholders - basic (usd per share) | $ 0.10 | $ 0.91 | $ (0.01) | $ (0.07) | $ 0.12 | $ 0.02 | $ 0.02 | $ 0.17 | $ 0.93 | $ 0.33 | $ 0.38
Net income (loss) attributable to common shareholders - per common share diluted (usd per share) | $ 0.10 | $ 0.90 | $ (0.01) | $ (0.07) | $ 0.12 | $ 0.02 | $ 0.02 | $ 0.17 | $ 0.93 | $ 0.33 | $ 0.37

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