Equity - Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended										9 Months Ended	12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Oct. 06, 2013	Dec. 31, 2014	Dec. 31, 2012
Numerator:
Net income	$ 10,964	$ 22,734	$ 25,281	$ 11,231	$ 193,431	$ 148,917	[1]	$ 2,281	$ 3,071	$ 1,930	$ (37,232)	$ 70,210	$ 48,643
Private perpetual preferred unit distributions					0							(476)
Net income attributable to non-controlling interests					(118,186)	(118,186)	[1]					(43,067)
Earnings allocated to unvested shares					(84)							(33)
Net income attributable to common stockholders - basic					75,161							26,634
Earnings allocated to unvested shares and LTIP units					(804)							(482)
Net income attributable to common stockholders - diluted					$ 192,627							$ 69,252
Denominator:
Weighted average shares outstanding - basic					95,463,000							97,941,000
Operating partnership units					148,957,000							156,565,000
Weighted average shares outstanding - dilutive					244,420,000							254,506,000
Earnings per share - basic and diluted	$ 0.04	$ 0.09	$ 0.10	$ 0.05	$ 0.79	$ 0.79	[1]					$ 0.27
Antidilutive securities					500,828							631,251

[1] The results of operations of our predecessor for October 1, 2013 through October 6, 2013 and the results of operations of our company for October 7, 2013 through December 31, 2013 have been combined.