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Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) segment	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2017 USD ($)
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Number of reportable segments (segment) | segment			1
Additional rental income			$ 4,828	$ 8,987
Reduction in income tax payable due to overstatement	$ (925)		(925)					$ (2,475)
Increase in accumulated other comprehensive income (loss) due to understatement	17,102		17,102					$ 19,447
Adjustments to comprehensive income (loss) attributable to common stockholders	$ (1,837)	$ 13,911	$ 5,481	$ 40,546
Restatement Adjustment
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Additional rental income		$ 500
Reduction in income tax payable due to overstatement					$ 4,700
Increase in accumulated other comprehensive income (loss) due to understatement					4,700
Adjustments to comprehensive income (loss) attributable to common stockholders					$ 2,900	$ 1,900	$ (100)
Minimum
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Lease-up period			12 months
Maximum
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Lease-up period			18 months

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