Income Taxes (Reconciliation of Net Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred Income Taxes and Tax Credits [Abstract]
Deferred tax assets - current	$ 73,075us-gaap_DeferredTaxAssetsGrossCurrent	$ 64,733us-gaap_DeferredTaxAssetsGrossCurrent
Deferred tax liabilities - current	(90,333)	(84,955)
Deferred tax liabilities - current	(17,258)	(20,222)
Deferred tax assets - noncurrent	92,657	81,870
Deferred tax liabilities - noncurrent	(177,821)	(162,583)
Deferred tax liabilities - noncurrent	(85,164)	(80,713)
Net deferred tax liabilities	$ (102,422)us-gaap_DeferredTaxAssetsLiabilitiesNet	$ (100,935)us-gaap_DeferredTaxAssetsLiabilitiesNet

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Amount before 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 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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Amount 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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Gross amount of noncurrent deferred tax liabilities, which result from applying the applicable tax rate to taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax.

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