Income Taxes (Asset/Liability) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Net losses and credit carryforwards	$ 98,633	$ 41,582
Deferred revenue	137,090us-gaap_DeferredTaxAssetsDeferredIncome	115,850us-gaap_DeferredTaxAssetsDeferredIncome
Bad debt reserves	2,962	5,205
Employee benefits	47,414	48,646
Accrued expenses and loss reserves	29,791	29,976
Other	(989)us-gaap_DeferredTaxAssetsOther	324us-gaap_DeferredTaxAssetsOther
Less: valuation allowance	(21,912)	(24,173)
Total deferred tax assets	292,989us-gaap_DeferredTaxAssetsNet	217,410us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:
Depreciable and amortizable assets	247,458	190,905
Investment in affiliates	19,169	16,985
Total deferred tax liabilities	266,627us-gaap_DeferredTaxLiabilities	207,890us-gaap_DeferredTaxLiabilities
Net deferred tax asset/(liability)	$ 26,362us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 9,520us-gaap_DeferredTaxAssetsLiabilitiesNet

Deferred Tax Assets Depreciable And Amortizable

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from deferred income.

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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 before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed.

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The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from employee benefit costs not otherwise specified in the taxonomy, which can only be deducted for tax purposes when actual costs are incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from loss reserves other than estimated credit losses.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the provision for loan losses.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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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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Amount of deferred tax liability attributable to taxable temporary differences from investments in unconsolidated subsidiaries and investments in other affiliates which are not controlled nor consolidated.

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