Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Assets:
Intangible lease assets, accumulated amortization	$ 91,235	$ 87,391
Deferred lease costs, accumulated amortization	192,949	183,611
Liabilities:
Intangible lease liabilities, accumulated amortization	61,382	59,144
Commitments and Contingencies (Note 6)
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)	125,597,374	126,218,554
Common stock, shares outstanding (in shares)	125,597,374	126,218,554
Unsecured Debt
Liabilities:
Discount, (premiums) and unamortized debt issuance costs	$ 9,354	$ 9,879
Secured Debt
Liabilities:
Discount, (premiums) and unamortized debt issuance costs	(569)	(645)
Building and improvements
Assets:
Buildings and improvements, accumulated depreciation	$ 797,112	$ 772,093