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Quarterly Operating Results (unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                      
Total revenue $ 70,321 $ 81,404 $ 77,909 $ 69,222 $ 67,236 $ 79,733 $ 78,001 $ 68,850 $ 298,856 $ 293,820 $ 276,950
Total operating expenses 60,579 61,044 67,000 57,195 57,319 60,275 59,429 57,861 245,818 234,884 221,427
Operating income 9,742 20,360 10,909 12,027 9,917 19,458 18,572 10,989 53,038 58,936 55,523
Net income attributable to common shareholders $ 5,438 $ 14,393 $ 5,034 $ 4,613 $ 2,660 $ 13,355 $ 12,168 $ 3,300 $ 29,243 $ 31,294 $ 32,815
Income per common share, basic (in dollars per share) $ 0.12 $ 0.36 $ 0.13 $ 0.12 $ 0.07 $ 0.35 $ 0.32 $ 0.09 $ 0.73 $ 0.82 $ 0.87
Income per common share, diluted (in dollars per share) $ 0.12 $ 0.36 $ 0.13 $ 0.12 $ 0.07 $ 0.34 $ 0.31 $ 0.08 $ 0.73 $ 0.81 $ 0.86
Weighted average number of common shares outstanding:                      
Basic (in shares) 43,205,683 39,298,974 38,525,306 38,361,113 38,315,040 38,307,382 38,299,132 38,274,448 39,859,143 38,299,067 37,917,871
Diluted (in shares) 43,522,022 39,550,494 38,749,661 38,573,928 38,525,598 38,768,638 38,734,987 38,671,129 40,112,266 38,482,875 38,322,285