Consolidated Statements Of Shareholders' Equity And Temporary Equity (USD $) In Thousands, unless otherwise specified	Temporary Equity-Redeemable Noncontrolling Interest [Member]	Temporary Equity-Eight Percent Convertible Perpetual Preferred Stock, Series B [Member]	Eight Percent Convertible Perpetual Preferred Stock, Liquidation Value [Member]	Common Stock [Member]	Paid-In Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock At Cost [Member]	Total
Balance, beginning of year at Dec. 31, 2008				$ 36	$ 400,334	$ 29,644	$ (112,754)	$ (911)
Balance, beginning of year, shares at Dec. 31, 2008				35,903				76
Sale of Class A Limited Partner Interest, net of formation costs	148,751
Income attributable to the redeemable noncontrolling interest	13,380					(13,380)			13,380
Limited partner distributions	(22,533)
Issuance of preferred stock			140,000	15	179,750
Issuance of preferred stock, shares			1,400	14,565
Issuances of common stock
Secondary offerings			140,000	15	179,750
Secondary offerings, shares			1,400	14,565
Costs of issuances					(13,588)
Exercise of stock options/warrants					4
Restricted stock, net of forfeitures, shares				211
Stock-based compensation					7,951
Preferred stock dividends					(2,856)
Net loss						(35,581)			(35,581)
Other comprehensive income (loss)							17,267		17,267
Balance, end of year at Dec. 31, 2009			140,000	51	571,595	(19,317)	(95,487)	(911)	595,931
Balance, end of year at Dec. 31, 2009
Balance, end of year at Dec. 31, 2009	139,598
Balance, end of year, shares at Dec. 31, 2009			1,400	50,679				76
Income attributable to the redeemable noncontrolling interest	15,503					(15,503)			15,503
Limited partner distributions	(14,250)
Issuances of common stock
Exercise of stock options/warrants					3,567
Exercise of stock options/warrants, shares				418
Restricted stock, net of forfeitures, shares				171
Stock-based compensation					6,825
Preferred stock dividends					(11,248)
Net loss						(322,046)			(322,046)
Other comprehensive income (loss)							(5,540)		(5,540)
Balance, end of year at Dec. 31, 2010			140,000	51	570,739	(356,866)	(101,027)	(911)	251,986
Balance, end of year at Dec. 31, 2010	140,851								140,851
Balance, end of year, shares at Dec. 31, 2010			1,400	51,268				76
Balance, beginning of year at Dec. 31, 2010
Income attributable to the redeemable noncontrolling interest	26,622					(26,622)			26,622
Limited partner distributions	(51,653)
Issuance of preferred stock		70,667	84,583
Issuance of preferred stock, shares		785	940
Transfer from shareholders equity		1,902
Transfer from shareholders equity, shares		22
Transfer to temporary equity			(1,902)
Transfer to temporary equity, shares			(22)
Issuances of common stock
Secondary offerings		70,667	84,583
Secondary offerings, shares		785	940
Issuance costs		(2,514)
Costs of issuances					(2,875)
Exercise of stock options/warrants					205
Exercise of stock options/warrants, shares				39
Restricted stock, net of forfeitures				1
Restricted stock, net of forfeitures, shares				652
Stock-based compensation					6,683
Purchase of capped-call options					(26,500)				(26,500)
Preferred stock dividends					(18,583)
Net loss						(165,277)			(165,277)
Other comprehensive income (loss)							(5,365)		(5,365)
Balance, end of year at Dec. 31, 2011			222,681	52	529,669	(548,765)	(106,392)	(911)	96,334
Balance, end of year at Dec. 31, 2011		70,055							70,055
Balance, end of year at Dec. 31, 2011	$ 115,820								$ 115,820
Balance, end of year, shares at Dec. 31, 2011		807	2,318	51,959				76