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Quarterly Operating Results (unaudited) (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]                      
Total revenue $ 77,044 $ 88,897 $ 85,374 $ 72,915 $ 71,165 $ 82,145 $ 78,647 $ 69,887 $ 324,230 $ 301,844 $ 295,871
Total operating expenses 68,707 68,522 66,237 62,630 58,095 61,785 67,738 57,861 266,078 248,806 236,935
Operating income 8,337 20,375 19,137 10,285 13,070 20,360 10,909 12,026 58,134 56,365 58,936
Net income attributable to common shareholders $ (174) $ 14,580 $ 13,387 $ 2,848 $ 5,438 $ 14,393 $ 5,034 $ 4,613 $ 30,331 $ 29,243 $ 31,294
Income per common share, basic (in dollars per share) $ 0.00 $ 0.31 $ 0.29 $ 0.06 $ 0.12 $ 0.36 $ 0.13 $ 0.12 $ 0.66 $ 0.73 $ 0.82
Income per common share, diluted (in dollars per share) $ 0.00 $ 0.31 $ 0.29 $ 0.06 $ 0.12 $ 0.36 $ 0.13 $ 0.12 $ 0.66 $ 0.73 $ 0.81
Weighted average number of common shares outstanding:                      
Basic (in shares) 46,513,688 46,149,765 45,867,625 45,753,792 43,205,683 39,298,974 38,525,306 38,361,113 46,073,515 39,859,143 38,299,067
Diluted (in shares) 46,765,797 46,384,969 46,084,688 46,022,690 43,522,022 39,550,494 38,749,661 38,573,928 46,243,660 40,112,266 38,482,875