CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Assets:
Intangible lease assets, accumulated amortization	$ (78,204)	$ (87,391)
Deferred lease costs, accumulated amortization	(182,281)	(176,919)
Liabilities:
Intangible lease liabilities, accumulated amortization	$ (51,566)	$ (59,144)
Stockholders' Equity:
Shares-in-trust, shares authorized	150,000,000	150,000,000
Shares-in-trust, shares outstanding	0	0
Preferred stock, par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares issued	125,783,408	126,218,554
Common stock, shares outstanding	125,783,408	126,218,554
Unsecured Debt
Liabilities:
Discount (premium) and unamortized debt issuance costs	$ 7,626	$ 9,879
Secured Debt
Liabilities:
Discount (premium) and unamortized debt issuance costs	(343)	(645)
Building and building improvements
Assets:
Buildings and improvements, accumulated depreciation	$ (797,573)	$ (718,070)