Investment in Unconsolidated Joint Venture - Condensed Income Statement (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Schedule of Equity Method Investments [Line Items]
Rental income	$ 26,104	$ 10,133	$ 53,275	$ 17,807
Other revenue	9,845	772	16,266	1,425
Total revenues	35,949	10,905	69,541	19,232
Property operating	14,079	2,448	28,084	4,185
Depreciation and amortization	23,463	5,986	47,717	10,272
Total operating expenses	103,751	6,204	143,440	15,187
Operating Income (Loss)	(67,802)	4,701	(73,899)	4,045
Interest expense	(4,813)	(2,694)	(8,752)	(4,840)
Net income (loss)	(67,748)	2,012	(75,903)	(790)
Net income (loss) attributable to stockholders	(67,237)	2,019	(75,393)	(775)
Company's share of net loss from Worldwide Plaza			5,446	0
Income from unconsolidated joint venture	4,189	0	5,446	0
Worldwide Plaza
Schedule of Equity Method Investments [Line Items]
Rental income	27,739		55,394
Other revenue	1,229		2,444
Total revenues	28,968		57,838
Property operating	10,779		22,292
Depreciation and amortization	6,260		12,628
Total operating expenses	17,039		34,920
Operating Income (Loss)	11,929		22,918
Interest expense	(9,992)		(19,874)
Net income (loss)	1,937		3,044
Company's preferred distribution	(1,334)		(7,745)
Net income (loss) attributable to stockholders	603		(4,701)
Company's preferred distribution	(3,894)		(7,745)
Company's share of net loss from Worldwide Plaza	(957)		(2,299)
Company's income from Worldwide Plaza	1,252		0
Income from unconsolidated joint venture	$ 4,189		$ 5,446