Consolidated Statements Of Shareholders' Equity And Temporary Equity (USD $) In Thousands	Temporary Equity-Redeemable Noncontrolling Interest [Member]	Temporary Equity-Eight Percent Convertible Perpetual Preferred Stock, Series B [Member]	Eight Percent Convertible Perpetual Preferred Stock [Member]	Eight Percent Convertible Perpetual Preferred Stock, Series B [Member]	Common Stock [Member]	Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Total
Balance, beginning of period at Dec. 31, 2009			$ 140,000	$ 0	$ 51	$ 571,595	$ (19,317)	$ (95,487)	$ (911)
Balance, beginning of period at Dec. 31, 2009
Balance, beginning of period at Dec. 31, 2009	139,598
Balance, beginning of period, shares at Dec. 31, 2009			1,400		50,679				76
Income attributable to the redeemable noncontrolling interest	12,355						(12,355)			12,355
Limited partner distributions	(10,688)
Issuance of common stock - exercise of stock options/warrants						3,552
Issuance of common stock - exercise of stock options/warrants, shares					415
Restricted stock, net of forfeitures, shares					178
Preferred stock dividends						(8,420)
Stock-based compensation						5,366
Net loss							(121,380)			(121,380)
Other comprehensive loss								(879)
Balance, end of period at Sep. 30, 2010			140,000		51	572,093	(153,052)	(96,366)	(911)	461,815
Balance, end of period at Sep. 30, 2010	141,265
Balance, end of period, shares at Sep. 30, 2010			1,400		51,272				76
Balance, beginning of period at Dec. 31, 2010			140,000	0	51	570,739	(356,866)	(101,027)	(911)	251,986
Balance, beginning of period at Dec. 31, 2010
Balance, beginning of period at Dec. 31, 2010	140,851									140,851
Balance, beginning of period, shares at Dec. 31, 2010			1,400	0	51,271				76
Income attributable to the redeemable noncontrolling interest	16,954						(16,954)			16,954
Limited partner distributions	(42,399)
Issuance of preferred stock		70,645		84,583
Issuance of preferred stock, shares		785		940
Issuance costs		(2,492)
Purchase of capped-call options						(26,500)				(26,500)
Issuance of common stock - exercise of stock options/warrants						223
Issuance of common stock - exercise of stock options/warrants, shares					34
Restricted stock, net of forfeitures					1
Restricted stock, net of forfeitures, shares					314
Issuance costs related to preferred stock						(2,976)
Preferred stock dividends						(12,270)
Stock-based compensation						4,669
Net loss							(152,766)			(152,766)
Other comprehensive loss								(2,041)
Balance, end of period at Sep. 30, 2011			140,000	84,583	52	533,885	(526,586)	(103,068)	(911)	127,955
Balance, end of period at Sep. 30, 2011		68,153								68,153
Balance, end of period at Sep. 30, 2011	$ 115,406									$ 115,406
Balance, end of period, shares at Sep. 30, 2011		785	1,400	940	51,619				76