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Quarterly Financial Information (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 revenues $ 189,333 $ 190,021 $ 180,500 $ 168,285 $ 167,198 $ 164,583 $ 154,321 $ 153,537 $ 728,139 $ 639,639 $ 520,850
Income from operations 43,832 36,160 28,108 28,503 26,845 23,740 19,811 19,011 136,603 89,407 47,388
Net income 48,944 14,510 6,954 24,153 28,530 5,217 4,035 5,976 $ 94,561 $ 43,758 $ (16,082)
Net income attributable to the Company’s stockholders $ 32,455 $ 11,064 $ 3,553 $ 20,515 $ 22,279 $ 1,847 $ 839 $ 2,253      
Net income attributable to common stockholders’ per share— basic (in dollars per share) $ 0.21 $ 0.07 $ 0.02 $ 0.14 $ 0.18 $ 0.02 $ 0.01 $ 0.03      
Net income attributable to common stockholders’ per share — diluted (in dollars per share) $ 0.21 $ 0.07 $ 0.02 $ 0.14 $ 0.18 $ 0.02 $ 0.01 $ 0.03