Classification of Deferred Tax Assets and Liabilities (USD $)	Dec. 31, 2014	Dec. 31, 2013
Deferred Tax Assets Liabilities Net [Abstract]
Current deferred tax assets	$ 0us-gaap_DeferredTaxAssetsNetCurrent	$ 55,329,000us-gaap_DeferredTaxAssetsNetCurrent
Current deferred tax liabilities	2,385,000us-gaap_DeferredTaxLiabilitiesCurrent	0us-gaap_DeferredTaxLiabilitiesCurrent
Noncurrent deferred tax assets	124,788,000us-gaap_DeferredTaxAssetsNetNoncurrent	90,214,000us-gaap_DeferredTaxAssetsNetNoncurrent
Noncurrent deferred tax liabilities	0	0
Net deferred tax assets (liabilities)	$ 122,400,000us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 145,500,000us-gaap_DeferredTaxAssetsLiabilitiesNet

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer.

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Amount after allocation of valuation allowances of noncurrent deferred tax asset attributable to deductible temporary differences and carryforwards. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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- Definition

Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed within one year or operating cycle, if longer.

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