Commitments and Contingencies (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Dec. 31, 2014
Other Commitments [Line Items]
Capital lease obligations	$ 41,171	$ 41,171	$ 20,822
Initial term of non cancellable operating leases, minimum (in years)		1 year
Capital lease
Remaining 2015	560	$ 560
2016	2,266	2,266
2017	2,387	2,387
2018	2,387	2,387
2019	2,411	2,411
Thereafter	828,103	828,103
Total minimum lease payments	838,114	838,114
Less amount representing interest	(796,943)	(796,943)
Capital lease obligations	41,171	41,171
Non-cancellable operating leases
Remaining 2015	7,675	7,675
2016	30,816	30,816
2017	31,049	31,049
2018	31,049	31,049
2019	31,066	31,066
Thereafter	795,787	795,787
Total minimum lease payments	$ 927,442	927,442
30 East 40th Street
Other Commitments [Line Items]
Land as percentage of fair market value of property under lease	63.60%
Capital lease obligations	$ 20,000	$ 20,000