Income Taxes Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Components of Deferred Tax Assets [Abstract]
Deferred compensation plans	$ 31,520	$ 14,271
Deferred income	752us-gaap_DeferredTaxAssetsDeferredIncome	6,328us-gaap_DeferredTaxAssetsDeferredIncome
Allowance for uncollectible receivables	1,323	1,295
Deferred liabilities	3,822	3,574
Deferred Tax Assets, Operating Loss Carryforwards	32,573	19,186
Deferred tax assets	69,990us-gaap_DeferredTaxAssetsGross	44,654us-gaap_DeferredTaxAssetsGross
Valuation allowance	(1,274)	(1,213)
Net deferred tax asset	68,716us-gaap_DeferredTaxAssetsNet	43,441us-gaap_DeferredTaxAssetsNet
Deferred Tax Liabilities, Gross [Abstract]
Intangible assets in excess of tax basis	151,210	22,749
Property and equipment in excess of tax basis	37,827	40,135
Other	11,485us-gaap_DeferredTaxLiabilitiesOther	2,246us-gaap_DeferredTaxLiabilitiesOther
Deferred tax liabilities	200,522us-gaap_DeferredIncomeTaxLiabilities	65,130us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax asset (liability)	(131,806)us-gaap_DeferredTaxAssetsLiabilitiesNet	(21,689)us-gaap_DeferredTaxAssetsLiabilitiesNet
Deferred income taxes	17,716us-gaap_DeferredTaxAssetsNetCurrent	8,927us-gaap_DeferredTaxAssetsNetCurrent
Net non-current deferred tax liability	$ (149,522)	$ (30,616)

Deferred Tax Asset, Deferred Liabilities

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Amount 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 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 temporary differences from share-based compensation.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the allowance for doubtful accounts.

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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 from intangible assets other than goodwill.

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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 net of valuation allowances expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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Amount of deferred tax liability attributable to taxable temporary differences not separately disclosed.

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Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.

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