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Selected Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 4 Months Ended 8 Months Ended 12 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2015
Jun. 05, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Quarterly Financial Information Disclosure [Abstract]                          
Total revenues $ 56,266 $ 52,211 $ 48,333 $ 110,130 $ 48,111 $ 48,179 $ 49,810 $ 46,836     $ 266,940 $ 192,936 $ 285,046
Net income 18,832 17,402 15,748 70,379 16,317 16,273 25,183 19,648 $ 18,841 $ 58,580 122,361 77,421 $ 10,293
Net income available for common shareholders $ 7,374 $ 6,698 $ 6,114 $ 17,054 $ 6,333 $ 970 $ 0 $ 0     $ 37,240 $ 7,303  
Net income available for common shareholders per share (in dollars per share) $ 0.46 $ 0.42 $ 0.38 $ 1.07 $ 0.40 $ 0.06 $ 0.00 $ 0.00     $ 2.33 $ 0.46  
Dividends declared (in dollars per share) $ 0.25 $ 0.2993 $ 0 $ 0.5260 $ 0 $ 0 $ 0 $ 0          
Incentive business management fee revenue       $ 62,263