Annual report pursuant to Section 13 and 15(d)

Income Taxes Components of Deferred Tax Assets (Details)

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Income Taxes Components of Deferred Tax Assets (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Deferred Tax Assets, Gross [Abstract]    
Net operating loss carryforwards - Federal $ 365,811,000 [1] $ 276,415,000 [1],[2]
Net operating loss carryforwards - State 49,847,000 [1] 37,485,000 [1],[2]
Capital Gains 81,388,000 81,388,000 [2]
Share-based compensation expense 4,165,000 6,918,000 [2]
United kingdom deferred tax assets 117,000 0 [2]
Other 19,565,000 7,290,000 [2]
Deferred Tax Assets, Total 520,893,000 409,496,000 [2]
Deferred Tax Liabilities [Abstract]    
Investment in limited partnerships (79,281,000) (43,425,000) [2]
Other (4,856,000) (12,952,000) [2]
Deferred Tax Liabilities, Total (84,137,000) (56,377,000) [2]
Net deferred tax assets 436,756,000 353,119,000 [2]
Less: net deferred tax asset valuation allowance (436,639,000) [3] (353,119,000) [2],[3]
Deferred Tax Assets, Net 117,000 0 [2]
Valuation Allowance [Abstract]    
Change in deferred tax asset valuation allowance $ 83,500,000 $ 33,400,000
[1] The federal net operating loss ("NOL") carryforward expires between 2017 and 2031. The state NOL carryforward expires between 2020 and 2026.
[2] We have made changes to the disclosed 2010 share-based compensation gross deferred tax asset and the disclosed 2010 investment in limited partnership gross deferred tax liability, which had a corresponding change in the 2010 valuation allowance. These changes do not affect the 2010 disclosed net deferred tax asset.
[3] A valuation allowance equal to our U.S. and state net deferred tax asset balance has been established due to the uncertainty of realizing the tax benefits related to our U.S. and state net deferred tax assets. The change in the U.S. and state deferred tax asset valuation allowance is $83.5 million and $33.4 million for the years ended December 31, 2011 and 2010, respectively.