Consolidated Statements of Changes in Equity (USD $) In Thousands, unless otherwise specified		Total USD ($)	Preferred Stock USD ($)		Series J Preferred Stock USD ($)		HPU's USD ($)	Common Stock at Par USD ($)	Additional Paid-In Capital USD ($)	Retained Earnings (Deficit) USD ($)	Accumulated Other Comprehensive Income (Loss) USD ($)	Treasury Stock at Cost USD ($)	Noncontrolling Interests USD ($)	Corporate Joint Venture [Member]	Net Lease Asset [Member] Corporate Joint Venture [Member]
Balance at Dec. 31, 2012		$ 1,313,154	$ 22		$ 0		$ 9,800	$ 143	$ 3,832,780	$ (2,360,647)	$ (1,185)	$ (241,969)	$ 74,210
Noncontrolling interest, ownership percentage by parent														63.00%	72.00%
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Preferred Stock		193,510			4	[1]			193,506
Dividends declared—preferred		(36,190)								(36,190)
Issuance of stock/restricted stock unit amortization, net		(2,875)						1	(2,876)
Net income (loss) for the period	[2]	(63,145)								(64,912)			1,767
Change in accumulated other comprehensive income (loss)		(2,960)									(2,960)
Additional paid in capital attributable to redeemable noncontrolling interest	[3]	(2,555)							(2,555)
Contributions from noncontrolling interests	[4]	9,951											9,951
Distributions to noncontrolling interests	[3]	(23,850)											(23,850)
Balance at Sep. 30, 2013		1,385,040	22	[1]	4	[1]	9,800	144	4,020,855	(2,461,749)	(4,145)	(241,969)	62,078
Balance at Jun. 30, 2013
Noncontrolling interest, ownership percentage by parent														63.00%	72.00%
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Change in accumulated other comprehensive income (loss)		(1,779)
Balance at Sep. 30, 2013		1,385,040	22	[1]			9,800					(241,969)
Balance at Dec. 31, 2013		1,301,465	22	[1]	4	[1]	9,800	144	4,022,138	(2,521,618)	(4,276)	(262,954)	58,205
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared—preferred		(38,490)								(38,490)
Issuance of stock/restricted stock unit amortization, net		(11,385)						2	(11,387)
Net income (loss) for the period	[5]	19,046								17,353			1,693
Change in accumulated other comprehensive income (loss)		927									927
Additional paid in capital attributable to redeemable noncontrolling interest		(1,091)							(1,091)
Contributions from noncontrolling interests		505											505
Distributions to noncontrolling interests		(4,787)											(4,787)
Change in noncontrolling interests(3)	[6]	(3,915)											(3,915)
Balance at Sep. 30, 2014		$ 1,262,275	$ 22	[1]	$ 4	[1]	$ 9,800	$ 146	$ 4,009,660	$ (2,542,755)	$ (3,349)	$ (262,954)	$ 51,701

[1] See Note 11 for details on the Company's Cumulative Redeemable Preferred Stock.

[2] For the nine months ended September 30, 2013, net loss shown above excludes $2,099 of net loss attributable to redeemable noncontrolling interests.

[3] Includes an $8.8 million payment to redeem a noncontrolling member's interest (see Note 4).

[4] Includes $9.4 million of operating property assets contributed by a noncontrolling partner.

[5] For the nine months ended September 30, 2014, net income shown above excludes $1,326 of net loss attributable to redeemable noncontrolling interests.

[6] During the nine months ended September 30, 2014, the Company sold its 72% interest in a previously consolidated entity to one of its unconsolidated ventures (see Note 4 and Note 6).