Condensed Consolidated Balance Sheets Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Tenant and other receivables allowance	$ 1,342	$ 499
Deferred rent receivables allowance	$ 534	$ 216
Preferred stock, par value	$ 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
Common Class A [Member]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	400,000,000	400,000,000
Common stock, shares issued	94,496,534	94,484,023
Common stock, shares outstanding	94,496,534	94,484,023
Common Class B [Member]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	1,122,130	1,122,130
Common stock, shares outstanding	1,122,130	1,122,130