Other Assets and Other Liabilities (Details) (USD $)	6 Months Ended
	Jun. 30, 2013		Dec. 31, 2012
Deferred expenses and other assets, net
Deferred financing fees, net(1)	$ 33,929,000	[1]	$ 26,629,000	[1]
Leasing costs, net(2)	20,277,000	[2]	20,205,000	[2]
Other receivables	9,498,000		11,517,000
Prepaid expenses	7,218,000		5,218,000
Corporate furniture, fixtures and equipment, net(3)	6,947,000	[3]	7,537,000	[3]
Derivative asset	2,471,000		0
Other assets	23,357,000		22,884,000
Deferred expenses and other assets, net	103,697,000		93,990,000
Accumulated amortization of deferred financing fees	4,900,000		4,100,000
Accumulated amortization on leasing costs	5,600,000		6,600,000
Accumulated depreciation on corporate furniture, fixtures and equipment	5,900,000		6,200,000
Accounts payable, accrued expenses and other liabilities
Accrued interest payable	36,730,000		29,521,000
Accrued expenses	38,716,000		50,467,000
Property taxes payable	10,573,000		8,206,000
Unearned operating lease income	8,976,000		11,294,000
Security deposits and other investment deposits	5,133,000	[4]	13,717,000	[4]
Derivative liabilities	2,043,000		3,435,000
Other liabilities	10,588,000		15,820,000
Accounts payable, accrued expenses and other liabilities	112,759,000		132,460,000
Restricted cash collateralizing a letter of credit, disbursed	$ 8,900,000

[1] Accumulated amortization on deferred financing fees was $4.9 million and $4.1 million as of June 30, 2013 and December 31, 2012, respectively.

[2] Accumulated amortization on leasing costs was $5.6 million and $6.6 million as of June 30, 2013 and December 31, 2012, respectively.

[3] Accumulated depreciation on corporate furniture, fixtures and equipment was $5.9 million and $6.2 million as of June 30, 2013 and December 31, 2012, respectively.

[4] During the six months ended June 30, 2013, $8.9 million of restricted cash collateralizing a letter of credit related to one of the Company's loan investments was disbursed.