Condensed Consolidated Statements of Equity (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	Series H Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Distributions in Excess of Accumulated Earnings [Member]	Accumulated Other Comprehensive Loss, Net [Member]	Noncontrolling Interest [Member]	Total
Balances at Dec. 31, 2013	$ 73,750	$ 4	$ 2,345,763	$ (474,426)	$ (60,472)	$ 113,619	$ 1,998,238
Balances (in shares) at Dec. 31, 2013	2,950,000	37,421,000
Net loss	0	0	0	29,583	0	5,251	34,834
Reversal of unrealized gains upon the sale of marketable securities	0	0	0	0	(841)	(45)	(886)
Change in fair value of cash flow hedges and amortization of swap settlements	0	0	0	0	4,105	188	4,293
Changes in fair value of marketable securities	0	0	0	0	3,414	162	3,576
Issuance of common stock under:
Stock Consideration in the Merger	0	2	3,777,644	0	0	0	3,777,646
Stock Consideration in the Merger (in shares)		23,093,000
Stock option and restricted stock plans	0	0	10,350	0	0	0	10,350
Stock option and restricted stock plans shares (in shares)	0	109,000
Equity distribution agreement	0	0	299,397	0	0	0	299,397
Equity distribution agreement (in shares)	0	1,644,000
Equity based compensation costs	0	0	(1,126)	0	0	1,266	140
Reclassification of noncontrolling interest to redeemable noncontrolling interest	0	0	(20,134)	0	0	1,368	(18,766)
Conversion of Series G Preferred		0	4,349	0	0	0	4,349
Conversion of Series G Preferred (in shares)		34,000
Contributions from non controlling interest	0	0	0	0	0	1,419,816	1,419,816
Retirement of noncontrolling interest	0	0	0	0	0	(1,419,816)	(1,419,816)
Distributions to noncontrolling interest	0	0	0	0	0	(7,510)	(7,510)
Redemptions of noncontrolling interest	0	0	(1,985)	0	0	(565)	(2,550)
Common and preferred stock dividends	0	0	0	(130,929)	0	0	(130,929)
Balances at Jun. 30, 2014	$ 73,750	$ 6	$ 6,414,258	$ (575,772)	$ (53,794)	$ 113,734	$ 5,972,182
Balances (in shares) at Jun. 30, 2014	2,950,000	62,301,000