Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income (loss) including noncontrolling interests in operating subsidiaries	$ (66,662)us-gaap_ProfitLoss	$ (58,842)us-gaap_ProfitLoss	$ 59,289us-gaap_ProfitLoss
Other comprehensive income (loss):
Unrealized loss on short-term investments	(1,488)	26	657
Unrealized gain on foreign currency translation	(128)	0	7
Add: reclassification adjustment for losses included in net income	2,210	193	277
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	(66,068)	(58,623)	60,230
Net (income) loss attributable to noncontrolling interests in operating subsidiaries	(633)	(2,408)	(164)
Comprehensive income	$ (65,435)us-gaap_ComprehensiveIncomeNetOfTax	$ (56,215)us-gaap_ComprehensiveIncomeNetOfTax	$ 60,394us-gaap_ComprehensiveIncomeNetOfTax

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 of Net Income (Loss) attributable to noncontrolling interest.

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Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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