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Quarterly Supplemental Financial Information (unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Quarterly Supplemental Financial Information [Abstract]                      
Total income $ 51,211 $ 52,545 $ 41,639 $ 52,438 $ 54,740 $ 58,169 $ 57,190 $ 56,391 $ 197,833 $ 226,490 $ 242,674
Net income (loss) from continuing operations 1,246 1,677 (9,611) (3,486) 28,694 24,926 6,278 4,001 (10,174) 63,899 83,849
Net loss from discontinued operations 0 0 0 0 0 0 (12,000) (13,500) 0 (25,500) 0
Net income (loss) $ 1,246 $ 1,677 $ (9,611) $ (3,486) $ 28,694 $ 24,926 $ (5,722) $ (9,499) $ (10,174) $ 38,399 $ 83,849
Net loss per common share, from discontinued operations, basic and diluted (in dollars per share)         $ 0 $ 0 $ (0.02) $ (0.02) $ 0 $ (0.04) $ 0
Net income (loss), per common share, basic and diluted (in dollars per share) $ 0 $ 0 $ (0.01) $ 0 $ 0.04 $ 0.03 $ (0.01) $ (0.01) $ (0.01) $ 0.05 $ 0.11
Weighted average number of common shares outstanding, basic (in shares) 718,940,463 718,934,723 720,849,620 720,825,864 728,544,149 728,722,763 728,654,374 728,558,989 719,882,476 728,620,309 761,139,011
Weighted average number of common shares outstanding, diluted (in shares) 719,858,839 719,568,339 720,849,620 720,825,864 729,536,570 729,456,722 729,287,663 728,827,861 719,882,476 729,384,149 762,065,474