Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Assets:
Intangible lease assets, accumulated amortization	$ 63,353	$ 50,766
Tenant receivables, allowance for doubtful accounts	4,831	0
Deferred lease costs, accumulated amortization	169,975	147,324
Liabilities:
Intangible lease liabilities, accumulated amortization	$ 24,881	$ 19,607
Stockholders’ Equity:
Shares-in-trust, shares authorized (in shares)	150,000,000	150,000,000
Shares-in-trust, shares outstanding (in shares)	0	0
Preferred stock, par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized (in shares)	100,000,000	100,000,000
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	750,000,000	750,000,000
Common stock, shares issued (in shares)	126,028,762	125,783,408
Common stock, shares outstanding (in shares)	126,028,762	125,783,408
Unsecured Debt
Liabilities:
Discount (premiums) and unamortized debt issuance costs	$ 11,589	$ 7,626
Secured Debt
Liabilities:
Discount (premiums) and unamortized debt issuance costs	(448)	(343)
Building and improvements
Assets:
Buildings and improvements, accumulated depreciation	$ 803,160	$ 730,750