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Income Taxes Deferred Income Tax Amounts Included on Consolidated Statements of Financial Position (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Current deferred income tax assets, net	$ 133,151us-gaap_DeferredTaxAssetsNetCurrent	$ 112,881us-gaap_DeferredTaxAssetsNetCurrent
Long-term deferred income tax liabilities, net	(26,807)	(10,601)
Total deferred income tax assets, net	$ 106,344us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 102,280us-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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