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Consolidated Statements of Comprehensive Loss (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net loss	$ (7,963)us-gaap_ProfitLoss	$ (13,610)us-gaap_ProfitLoss
Other comprehensive loss, net of tax:
Unrealized loss resulting from changes in fair value of marketable securities	(34)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	(3)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Other comprehensive loss, net of tax	(34)us-gaap_OtherComprehensiveIncomeLossNetOfTax	(3)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive loss	(7,997)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	(13,613)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Less: Comprehensive income (loss) attributable to noncontrolling interests	1,308us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	(187)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
Comprehensive loss attributable to common stockholders	$ (9,305)us-gaap_ComprehensiveIncomeNetOfTax	$ (13,426)us-gaap_ComprehensiveIncomeNetOfTax

X

- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income (loss) and other comprehensive income (loss), attributable to noncontrolling interests. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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