Consolidated Statements of Changes in Equity (USD $) In Thousands	Total	Class A Common Stock [Member]	Restricted Class A Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Income [Member]	Accumulated Deficit [Member]	Total [Member]	Non-controlling Interests [Member]
Balance at Dec. 31, 2012	$ 153,453	$ 293		$ 609,002		$ (535,851)	$ 73,444	$ 80,009
Deferred directors' compensation	38			38			38
Net (loss) income	(1,597)					(3,115)	(3,115)	1,518
Consolidation of subsidiaries	11,963					5,728	5,728	6,235
Distributions to non-controlling interests	(1,412)							(1,412)
Balance at Mar. 31, 2013	162,445	293		609,040		(533,238)	76,095	86,350
Balance at Dec. 31, 2013	756,750	288	7	1,252,986	798	(536,170)	717,909	38,841
Shares of class A common stock issued	256,093	99		255,994			256,093
Restricted class A common stock earned	1,740		(1)	1,741			1,740
Deferred directors' compensation	139			139			139
Other comprehensive income	36				36		36
Net (loss) income	13,116					13,065	13,065	51
Dividends declared on common stock	(18,899)					(18,899)	(18,899)
Distributions to non-controlling interests	(575)							(575)
Balance at Mar. 31, 2014	$ 1,008,400	$ 387	$ 6	$ 1,510,860	$ 834	$ (542,004)	$ 970,083	$ 38,317