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Income Taxes - Summary of Deferred Tax Asset and Liabilities, as Reported in the Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Summary of Deferred Tax Assets and Liabilities, as Reported in the Balance Sheet [Abstract]
Net current deferred tax assets	$ 37	$ 1,182
Net non-current deferred tax liabilities	(18,496)	(21,287)
Total net deferred tax liabilities:	$ (18,459)	$ (20,105)

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

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