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Quarterly Operating Results (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 Financial Information Disclosure [Abstract]                      
Total revenue $ 29,565 $ 34,969 $ 20,173 $ 60,209 $ 74,695 $ 90,080 $ 87,874 $ 75,679 $ 144,916 $ 328,328 $ 324,230
Total operating expenses 24,667 45,214 38,793 77,895 67,234 70,182 71,741 65,786      
Operating income 4,898 (10,245) (18,620) (17,686) 7,461 19,898 16,133 9,893 (41,653) 53,385 58,134
Net income attributable to common shareholders $ (3,356) $ (18,057) $ (26,827) $ (27,783) $ (2,349) $ 10,002 $ 9,437 $ 1,613 $ (76,023) $ 18,703 $ 30,641
Income per common share, basic (in dollars per share) $ (0.07) $ (0.38) $ (0.57) $ (0.59) $ (0.05) $ 0.21 $ 0.20 $ 0.03 $ (1.62) $ 0.39 $ 0.66
Income per common share, diluted (in dollars per share) $ (0.07) $ (0.38) $ (0.57) $ (0.59) $ (0.05) $ 0.21 $ 0.20 $ 0.03 $ (1.62) $ 0.39 $ 0.66
Weighted average number of common shares outstanding:                      
Basic (in shares) 46,969,483 46,965,526 46,960,289 46,948,533 46,919,035 46,913,922 46,760,016 46,556,710 46,961,039 46,788,784 46,073,515
Diluted (in shares) 46,969,483 46,965,526 46,960,289 46,948,533 47,220,671 47,152,166 46,976,999 46,734,958 46,961,039 47,023,280 46,243,660