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Equity, Earnings Per Share ("EPS") (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Basic              
Net income attributable to common stockholders $ 27,737 $ 16,421 $ 71,093 $ 43,964      
Weighted average shares outstanding (in shares) 74,802,582 61,582,796 67,490,132 56,602,504      
Net income per common share (in dollars per share) $ 0.37 $ 0.27 $ 1.05 $ 0.78      
Diluted              
Net income attributable to noncontrolling interest $ 7,799 $ 5,662 $ 22,347 $ 16,597      
Net income attributable to common stockholders and noncontrolling interest $ 35,536 $ 22,083 $ 93,440 $ 60,561      
Weighted average shares outstanding (in shares) 74,802,582 61,582,796 67,490,132 56,602,504      
Dilutive effect of OP units (in shares) 21,023,735 21,230,769 21,160,999 21,230,769      
Dilutive effect of restricted stock units (in shares) 1,559,217 1,104,552 1,441,264 1,077,178      
Dilutive effect of convertible notes (in shares) 1,050,430   1,041,212 32,468      
Weighted average shares outstanding ( in shares) 98,435,964 83,918,117 91,133,607 78,942,919      
Net income per common share (in dollars per share) $ 0.36 $ 0.26 $ 1.03 $ 0.77      
Chief executive officer | Performance-based restricted stock              
Diluted              
Vesting period (in years)     4 years   4 years 4 years 4 years