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(Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Selected Quarterly Financial Data [Abstract]                      
Net revenues $ 81,260,000 $ 84,301,000 $ 84,174,000 $ 83,076,000 $ 82,196,000 $ 81,682,000 $ 78,096,000 $ 76,107,000 $ 332,811,000 $ 318,081,000 $ 294,612,000
Net income attributable to common stockholders $ 37,140,000 $ 42,595,000 $ 44,368,000 $ 61,023,000 $ 42,040,000 $ 42,758,000 $ 39,979,000 $ 35,679,000 $ 185,126,000 $ 160,456,000 $ 154,333,000
Weighted average common shares outstanding:                      
Basic 44,859,894 44,661,650 44,650,002 44,613,593 44,107,770 43,505,332 43,232,384 42,825,824 44,696,285 43,417,828 41,943,873
Diluted 44,861,469 44,662,403 44,650,002 44,618,139 44,328,847 43,861,089 43,498,021 43,125,032 44,698,004 43,703,248 42,091,731
Basic:                      
Net income per common share attributable to common stockholders $ 0.83 $ 0.95 $ 0.99 $ 1.37 $ 0.95 $ 0.98 $ 0.92 $ 0.83 $ 4.14 $ 3.70 $ 3.68
Diluted:                      
Net income per common share attributable to common stockholders $ 0.83 $ 0.95 $ 0.99 $ 1.37 $ 0.95 $ 0.97 $ 0.92 $ 0.83 $ 4.14 $ 3.67 $ 3.67