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Selected Quarterly Financial Data (Unaudited) Selected Quarterly Financial Data (Unaudited) (Quarterly Financial Information - 2014) (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
Selected Quarterly Financial Data [Abstract]                      
Net revenues $ 71,083 $ 71,352 $ 69,836 $ 66,388 $ 64,987 $ 63,251 $ 61,204 $ 59,018 $ 278,659 $ 248,460 $ 228,948
Net income attributable to common stockholders $ 37,798 $ 39,092 $ 38,245 $ 44,230 $ 41,188 $ 33,032 $ 44,595 $ 32,725 $ 159,365 $ 151,540 $ 148,862
Weighted average common shares outstanding:                      
Basic 41,532,130 41,108,699 40,982,244 39,953,804 39,847,860 39,283,919 38,520,221 38,401,647 40,894,219 39,013,412 37,604,594
Diluted 41,803,615 41,448,263 41,245,173 40,108,762 39,993,445 39,651,900 38,561,384 38,414,791 41,151,453 39,155,380 37,644,171
Basic:                      
Net income per common share attributable to common stockholders $ 0.91 $ 0.95 $ 0.93 $ 1.11 $ 1.03 $ 0.84 $ 1.16 $ 0.85 $ 3.90 $ 3.88 $ 3.96
Diluted:                      
Net income per common share attributable to common stockholders $ 0.90 $ 0.94 $ 0.93 $ 1.10 $ 1.03 $ 0.83 $ 1.16 $ 0.85 $ 3.87 $ 3.87 $ 3.95