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(Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Selected Quarterly Financial Data [Abstract]                      
Net revenues $ 82,196 $ 81,682 $ 78,096 $ 76,107 $ 73,995 $ 74,915 $ 72,956 $ 72,746 $ 318,081 $ 294,612 $ 278,659
Net income attributable to common stockholders $ 42,040 $ 42,758 $ 39,979 $ 35,679 $ 37,083 $ 40,979 $ 37,839 $ 38,432 $ 160,456 $ 154,333 $ 159,365
Weighted average common shares outstanding:                      
Basic 44,107,770 43,505,332 43,232,384 42,825,824 42,351,443 42,187,077 41,704,819 41,532,154 43,417,828 41,943,873 40,894,219
Diluted 44,328,847 43,861,089 43,498,021 43,125,032 42,568,720 42,434,499 41,786,829 41,576,876 43,703,248 42,091,731 41,151,453
Basic:                      
Net income per common share attributable to common stockholders $ 0.95 $ 0.98 $ 0.92 $ 0.83 $ 0.88 $ 0.97 $ 0.91 $ 0.93 $ 3.70 $ 3.68 $ 3.90
Diluted:                      
Net income per common share attributable to common stockholders $ 0.95 $ 0.97 $ 0.92 $ 0.83 $ 0.87 $ 0.97 $ 0.91 $ 0.92 $ 3.67 $ 3.67 $ 3.87