Condensed Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2013	Oct. 06, 2013	Dec. 31, 2014	Dec. 31, 2012
Revenues:
Rental revenue	$ 79,987	$ 148,690	$ 400,825	$ 196,187
Tenant expense reimbursement	15,836	21,272	67,651	29,483
Observatory revenue	23,735		111,541
Construction revenue	5,265	18,636	38,648	18,902
Third-party management and other fees	550	5,067	2,376	5,103
Other revenue and fees	2,210	12,407	14,285	10,619
Total revenues	127,583	206,072	635,326	260,294
Operating expenses:
Property operating expenses	34,055	41,297	151,048	55,707
Ground rent expenses	398		5,339
Marketing, general, and administrative expenses	16,379	23,600	39,037	20,963
Observatory expenses	5,687		29,041
Construction expenses	5,468	19,821	38,596	19,592
Real estate taxes	17,191	24,331	82,131	30,406
Formation transaction expenses	0	4,507	0	2,247
Acquisition expenses	138,140		3,382
Depreciation and amortization	27,375	38,963	145,431	42,690
Total operating expenses	244,693	152,519	494,005	171,605
Total operating income (loss)	(117,110)	53,553	141,321	88,689
Other income (expense):
Equity in net income of non-controlled entities	0	14,875	0	14,348
Interest expense	(13,147)	(50,660)	(66,456)	(54,394)
Settlement expense	0	(55,000)	0
Gain on consolidation of non-controlled entities	322,563		0
Income (loss) before income taxes	192,306	(37,232)	74,865	48,643
Income tax (expense) benefit	1,125		(4,655)
Net income (loss)	193,431	(37,232)	70,210	48,643
Private perpetual preferred unit distributions	0		(476)
Net income attributable to non-controlling interests	(118,186)		(43,067)
Net loss (income) attributable to the predecessor	0		0
Net income attributable to common stockholders	75,245		26,667
Total weighted average shares:
Basic (in shares)	95,463		97,941
Diluted (in shares)	244,420		254,506
Net income per share attributable to common stockholders:
Basic earnings per share	$ 0.79		$ 0.27
Diluted earnings per share	$ 0.79		$ 0.27
Predecessor [Member]
Revenues:
Rental revenue		148,690		196,187
Tenant expense reimbursement		21,272		29,483
Observatory revenue		0		0
Construction revenue		18,636		18,902
Third-party management and other fees		5,067		5,103
Other revenue and fees		12,407		10,619
Total revenues		206,072		260,294
Operating expenses:
Property operating expenses		41,297		55,707
Ground rent expenses		0		0
Marketing, general, and administrative expenses		23,600		20,963
Observatory expenses		0		0
Construction expenses		19,821		19,592
Real estate taxes		24,331		30,406
Formation transaction expenses		4,507		2,247
Acquisition expenses		0		0
Depreciation and amortization		38,963		42,690
Total operating expenses		152,519		171,605
Total operating income (loss)		53,553		88,689
Other income (expense):
Equity in net income of non-controlled entities		14,875		14,348
Interest expense		(50,660)		(54,394)
Settlement expense		(55,000)		0
Gain on consolidation of non-controlled entities		0		0
Income (loss) before income taxes		(37,232)		48,643
Income tax (expense) benefit		0		0
Net income (loss)		(37,232)		48,643
Private perpetual preferred unit distributions		0		0
Net income attributable to non-controlling interests		0		0
Net loss (income) attributable to the predecessor		37,232		(48,643)
Net income attributable to common stockholders		$ 0		$ 0