Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Tenant and other receivables allowance	$ 2,792	$ 1,427
Deferred rent receivables allowance	$ 245	$ 420
Preferred stock, par value (USD per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Private perpetual preferred units, liquidation preference per share (in dollars per share)	$ 16.62	$ 16.62
Private perpetual preferred units, issued, shares	1,560,360	1,560,360
Private perpetual preferred units, outstanding, shares	1,560,360	1,560,360
Common Class A [Member]
Common stock, par value (USD per share)	$ 0.01	$ 0.01
Common stock, shares authorized	400,000,000	400,000,000
Common stock, shares issued	118,903,312	106,030,449
Common stock, shares outstanding	118,903,312	106,030,449
Common Class B [Member]
Common stock, par value (USD per share)	$ 0.01	$ 0.01
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	1,120,067	1,161,438
Common stock, shares outstanding	1,120,067	1,161,438