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Income Taxes (Details 4) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred income tax assets and liabilities on consolidated balance sheets
Current deferred income tax assets	$ 4,427	$ 3,078
Long term deferred income tax liabilities	(10,326)	(15,121)
Net deferred tax liability	$ (5,899)	$ (12,043)

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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- 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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