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Income Taxes Income Taxes - Deferred Tax Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred Tax Assets:    
Basis difference – investments $ 20,049us-gaap_DeferredTaxAssetsInvestments $ 87,105us-gaap_DeferredTaxAssetsInvestments
Federal net operating loss carryforwards 227,519us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic 179,076us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
State net operating loss carryforwards 16,922us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal 14,436us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
Other 5,102us-gaap_DeferredTaxAssetsOther 3,519us-gaap_DeferredTaxAssetsOther
Gross deferred tax asset 269,592us-gaap_DeferredTaxAssetsGross 284,136us-gaap_DeferredTaxAssetsGross
Valuation allowance (268,592)us-gaap_DeferredTaxAssetsValuationAllowance (282,988)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax assets, net 1,000us-gaap_DeferredTaxAssetsNet [1] 1,148us-gaap_DeferredTaxAssetsNet
Deferred Tax Liabilities:    
Other 1,000us-gaap_DeferredTaxLiabilitiesOther 1,148us-gaap_DeferredTaxLiabilitiesOther
Deferred tax liability 1,000us-gaap_DeferredTaxLiabilities [1] 1,148us-gaap_DeferredTaxLiabilities
Deferred tax asset $ 0us-gaap_DeferredTaxAssetsLiabilitiesNet $ 0us-gaap_DeferredTaxAssetsLiabilitiesNet
[1] The noncurrent portion of deferred tax assets is included in the deferred income tax assets, net line within the noncurrent assets section of the Company's consolidated balance sheets. As of both December 31, 2014 and 2013, the current portion of deferred tax assets was not material and is netted against the current deferred income tax liability in accordance with the relevant accounting guidance.