Income Taxes (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Net deferred income tax liabilities
Deferred income tax assets	$ 68,829	$ 90,374
Deferred income tax liabilities	(48,830)	(64,320)
Valuation allowance	(17,741)	(22,888)
Net deferred income tax liabilities	$ 2,258	$ 3,166

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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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.

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Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances.

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