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Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
Income Taxes (Narrative) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule Of Income Taxes [Line Items]
U.S. statutory rate	35.00%
Net income (loss) before taxes	$ (894,944,000)	$ (89,037,000)	$ (111,998,000)
Valuation allowance for deferred tax assets	335,251,000	103,171,000
Unrecognized tax benefit		6,820,000us-gaap_UnrecognizedTaxBenefits	6,820,000us-gaap_UnrecognizedTaxBenefits
Increase in unrecognized tax benefit	700,000
Incurred income tax interest or penalty expense	0	0	0
U.S. [Member]
Schedule Of Income Taxes [Line Items]
Net income (loss) before taxes	(137,440,000)	(44,591,000)	(91,383,000)
Valuation allowance for deferred tax assets	149,700,000	103,000,000
Increase (decrease) in valuation allowance	47,000,000	18,300,000
U.S. [Member] \| Net Revisions [Member]
Schedule Of Income Taxes [Line Items]
Increase (decrease) in valuation allowance		2,900,000
U.S. [Member] \| Net Operating Loss [Member]
Schedule Of Income Taxes [Line Items]
Increase (decrease) in valuation allowance		15,400,000	29,100,000
U.S. [Member] \| Net Operating Loss In Other Jurisdictions [Member]
Schedule Of Income Taxes [Line Items]
Increase (decrease) in valuation allowance		200,000
U.K. [Member]
Schedule Of Income Taxes [Line Items]
Net income (loss) before taxes	(741,005,000)	(35,273,000)	(22,959,000)
Valuation allowance for deferred tax assets	185,500,000
Increase (decrease) in valuation allowance	185,500,000
All Others [Member]
Schedule Of Income Taxes [Line Items]
Increase (decrease) in valuation allowance	(400,000)
All Others [Member] \| Net Operating Loss In Other Jurisdictions [Member]
Schedule Of Income Taxes [Line Items]
Increase (decrease) in valuation allowance			$ (3,000,000)