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Equity Equity - Shares Issued and Gross Proceeds (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Class of Stock [Line Items]      
Stock Redeemed or Called During Period, Shares (2,791,262) (790,941)  
Common Stock, Shares, Outstanding 77,660,266 77,175,283 70,939,647
Common Class T [Member]      
Class of Stock [Line Items]      
Stock Redeemed or Called During Period, Shares 0 0  
Common Stock, Shares, Outstanding 226,297 4,148 0
Common Class S [Member]      
Class of Stock [Line Items]      
Stock Redeemed or Called During Period, Shares 0 0  
Common Stock, Shares, Outstanding 277 268 0
Common Class D [Member]      
Class of Stock [Line Items]      
Stock Redeemed or Called During Period, Shares 0 0  
Common Stock, Shares, Outstanding 19,157 268 0
Common Class I [Member]      
Class of Stock [Line Items]      
Stock Redeemed or Called During Period, Shares 0 0  
Common Stock, Shares, Outstanding 803,069 267,476 0
Common Class A [Member]      
Class of Stock [Line Items]      
Stock Redeemed or Called During Period, Shares (1,351,178) (557,206)  
Common Stock, Shares, Outstanding 25,781,325 25,995,943 25,562,982
Common Class AA [Member]      
Class of Stock [Line Items]      
Stock Redeemed or Called During Period, Shares (1,434,491) (233,735)  
Common Stock, Shares, Outstanding 49,840,818 49,942,471 44,595,631
Common Class AAA [Member]      
Class of Stock [Line Items]      
Stock Redeemed or Called During Period, Shares (5,593) 0  
Common Stock, Shares, Outstanding 989,323 964,709 781,034
IPO [Member]      
Class of Stock [Line Items]      
Common Stock, Gross Proceeds Received to Date, New Issues $ 733,987 $ 726,557  
Common stock issued (shares) 73,694,264 72,931,727  
IPO [Member] | Common Class T [Member]      
Class of Stock [Line Items]      
Common Stock, Gross Proceeds Received to Date, New Issues $ 2,245 $ 41  
Common stock issued (shares) 224,647 4,144  
IPO [Member] | Common Class S [Member]      
Class of Stock [Line Items]      
Common Stock, Gross Proceeds Received to Date, New Issues $ 3 $ 3  
Common stock issued (shares) 264 264  
IPO [Member] | Common Class D [Member]      
Class of Stock [Line Items]      
Common Stock, Gross Proceeds Received to Date, New Issues $ 182 $ 3  
Common stock issued (shares) 18,921 264  
IPO [Member] | Common Class I [Member]      
Class of Stock [Line Items]      
Common Stock, Gross Proceeds Received to Date, New Issues $ 7,538 $ 2,493  
Common stock issued (shares) 786,573 263,200  
IPO [Member] | Common Class A [Member]      
Class of Stock [Line Items]      
Common Stock, Gross Proceeds Received to Date, New Issues $ 240,780 $ 240,780  
Common stock issued (shares) 24,199,764 24,199,760  
IPO [Member] | Common Class AA [Member]      
Class of Stock [Line Items]      
Common Stock, Gross Proceeds Received to Date, New Issues $ 474,858 $ 474,858  
Common stock issued (shares) 47,562,870 47,562,870  
IPO [Member] | Common Class AAA [Member]      
Class of Stock [Line Items]      
Common Stock, Gross Proceeds Received to Date, New Issues $ 8,381 $ 8,379  
Common stock issued (shares) 901,225 901,225  
Distribution Reinvestment Plan      
Class of Stock [Line Items]      
Common Stock, Gross Proceeds Received to Date, New Issues $ 58,376 $ 41,954  
Common stock issued (shares) 6,152,779 4,440,514  
Distribution Reinvestment Plan | Common Class T [Member]      
Class of Stock [Line Items]      
Common Stock, Gross Proceeds Received to Date, New Issues $ 16 $ 0  
Common stock issued (shares) 1,650 4  
Distribution Reinvestment Plan | Common Class S [Member]      
Class of Stock [Line Items]      
Common Stock, Gross Proceeds Received to Date, New Issues $ 0 $ 0  
Common stock issued (shares) 13 4  
Distribution Reinvestment Plan | Common Class D [Member]      
Class of Stock [Line Items]      
Common Stock, Gross Proceeds Received to Date, New Issues $ 2 $ 0  
Common stock issued (shares) 236 4  
Distribution Reinvestment Plan | Common Class I [Member]      
Class of Stock [Line Items]      
Common Stock, Gross Proceeds Received to Date, New Issues $ 158 $ 41  
Common stock issued (shares) 16,496 4,276  
Distribution Reinvestment Plan | Common Class A [Member]      
Class of Stock [Line Items]      
Common Stock, Gross Proceeds Received to Date, New Issues $ 25,328 $ 19,773  
Common stock issued (shares) 2,669,097 2,089,748  
Distribution Reinvestment Plan | Common Class AA [Member]      
Class of Stock [Line Items]      
Common Stock, Gross Proceeds Received to Date, New Issues $ 32,369 $ 21,828  
Common stock issued (shares) 3,412,273 2,313,170  
Distribution Reinvestment Plan | Common Class AAA [Member]      
Class of Stock [Line Items]      
Common Stock, Gross Proceeds Received to Date, New Issues $ 503 $ 312  
Common stock issued (shares) 53,014 33,308  
Share Distribution [Member]      
Class of Stock [Line Items]      
Common stock issued (shares) 568,485 568,483  
Share Distribution [Member] | Common Class T [Member]      
Class of Stock [Line Items]      
Common stock issued (shares) 0 0  
Share Distribution [Member] | Common Class S [Member]      
Class of Stock [Line Items]      
Common stock issued (shares) 0 0  
Share Distribution [Member] | Common Class D [Member]      
Class of Stock [Line Items]      
Common stock issued (shares) 0 0  
Share Distribution [Member] | Common Class I [Member]      
Class of Stock [Line Items]      
Common stock issued (shares) 0 0  
Share Distribution [Member] | Common Class A [Member]      
Class of Stock [Line Items]      
Common stock issued (shares) 263,642 263,641  
Share Distribution [Member] | Common Class AA [Member]      
Class of Stock [Line Items]      
Common stock issued (shares) 300,166 300,166  
Share Distribution [Member] | Common Class AAA [Member]      
Class of Stock [Line Items]      
Common stock issued (shares) 4,677 4,676  
Restricted Stock Issuance [Member]      
Class of Stock [Line Items]      
Common stock issued (shares) 36,000 25,500  
Restricted Stock Issuance [Member] | Common Class T [Member]      
Class of Stock [Line Items]      
Common stock issued (shares) 0 0  
Restricted Stock Issuance [Member] | Common Class S [Member]      
Class of Stock [Line Items]      
Common stock issued (shares) 0 0  
Restricted Stock Issuance [Member] | Common Class D [Member]      
Class of Stock [Line Items]      
Common stock issued (shares) 0 0  
Restricted Stock Issuance [Member] | Common Class I [Member]      
Class of Stock [Line Items]      
Common stock issued (shares) 0 0  
Restricted Stock Issuance [Member] | Common Class A [Member]      
Class of Stock [Line Items]      
Common stock issued (shares) 0 0  
Restricted Stock Issuance [Member] | Common Class AA [Member]      
Class of Stock [Line Items]      
Common stock issued (shares) 0 0  
Restricted Stock Issuance [Member] | Common Class AAA [Member]      
Class of Stock [Line Items]      
Common stock issued (shares) 36,000 25,500