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Quarterly Operating Results (unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]                      
Total revenue $ 67,236 $ 79,733 $ 78,001 $ 68,850 $ 67,548 $ 78,229 $ 72,257 $ 58,916 $ 293,820 $ 276,950 $ 197,216
Total operating expenses 57,319 60,275 59,429 57,861 58,634 58,115 54,191 50,487 234,884 221,427 170,520
Operating income 9,917 19,458 18,572 10,989 8,914 20,114 18,066 8,429 58,936 55,523 26,696
Net income attributable to common shareholders $ 2,660 $ 13,355 $ 12,168 $ 3,300 $ 4,477 $ 14,315 $ 12,763 $ 1,411 $ 31,294 $ 32,815 $ 66,333
Income (loss) per common share, basic (in dollars per share) $ 0.07 $ 0.35 $ 0.32 $ 0.09 $ 0.12 $ 0.37 $ 0.33 $ 0.04 $ 0.82 $ 0.87 $ 2.32
Income (loss) per common share, diluted (in dollars per share) $ 0.07 $ 0.34 $ 0.31 $ 0.08 $ 0.12 $ 0.37 $ 0.33 $ 0.04 $ 0.81 $ 0.86 $ 2.30
Weighted average number of common shares outstanding:                      
Basic (in shares) 38,315,040 38,307,382 38,299,132 38,274,448 38,213,219 38,212,028 38,211,833 37,018,039 38,299,067 37,917,871 28,531,094
Diluted (in shares) 38,525,598 38,768,638 38,734,987 38,671,129 38,619,472 38,614,360 38,618,824 37,322,278 38,482,875 38,322,285 28,846,724