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Quarterly Financial Summary (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 76,327 $ 54,483 $ 82,717 $ 87,234 $ 87,666 $ 79,042 $ 81,746 $ 83,050 $ 300,761 $ 331,504 $ 316,965
Income (loss) from operations 6,153 (13,779) (499) 4,254 5,438 (455) (5,580) (7,205) (3,871) (7,802) (35,275)
Net income (loss) $ 6,450 $ (13,268) $ 10,142 $ 4,684 $ 5,477 $ (365) $ (5,263) $ (7,717) $ 8,008 $ (7,868) $ (32,682)
Net income (loss) per share - basic (in dollars per share) $ 0.10 $ (0.45) $ 0.18 $ 0.07 $ 0.09 $ (0.07) $ (0.26) $ (0.36) $ 0.05 $ (0.52) $ (1.51)
Net income (loss) per share - diluted (in dollars per share) $ 0.09 $ (0.45) $ 0.18 $ 0.07 $ 0.09 $ (0.07) $ (0.26) $ (0.36) $ 0.05 $ (0.52) $ (1.51)