Equity - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Numerator:
Net income	$ 16,705	$ 7,888
Private perpetual preferred unit distributions	(234)	(234)
Net income attributable to non-controlling interests	(9,043)	(4,516)
Earnings allocated to unvested shares	(8)	(7)
Net income attributable to common stockholders - basic	7,420	3,131
Earnings allocated to unvested shares and LTIP units	(172)	(144)
Net income attributable to common stockholders - diluted	$ 16,299	$ 7,510
Denominator:
Weighted average shares outstanding - basic (in shares)	120,778,000	109,400,000
Operating partnership units (in shares)	145,356,000	156,410,000
Stock-based compensation plans (in shares)	507,000	0
Weighted average shares outstanding - diluted (in shares)	266,641,000	265,810,000
Basic (in USD per share)	$ 0.06	$ 0.03
Diluted (in USD per share)	$ 0.06	$ 0.03
Antidilutive securities (in shares)	0	630,843