Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Assets:
Intangible lease assets, accumulated amortization	$ 95,908	$ 93,012
Tenant receivables, allowance for doubtful accounts	141	83
Deferred lease costs, accumulated amortization	157,609	146,700
Liabilities:
Intangible lease liabilities, accumulated amortization	$ 45,130	$ 42,315
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	145,229,642	145,511,644
Common stock, shares outstanding	145,229,642	145,511,644
Unsecured Debt [Member]
Liabilities:
Discount, (premiums) and unamortized debt issuance costs	$ 11,551	$ 12,779
Secured Debt [Member]
Liabilities:
Discount, (premiums) and unamortized debt issuance costs	(1,249)	(1,319)
Building and improvements Member]
Assets:
Buildings and improvements, accumulated depreciation	$ 919,863	$ 889,857