Income Taxes (Deferred Tax Liabilities (Assets)) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Depreciation	$ 18,896	$ 19,278
Goodwill	29,175	33,982
Intangible assets	18,637	20,951
Other	1,464us-gaap_DeferredTaxLiabilitiesOther	1,466us-gaap_DeferredTaxLiabilitiesOther
Gross deferred tax liabilities	68,172us-gaap_DeferredTaxLiabilities	75,677us-gaap_DeferredTaxLiabilities
Equity compensation	(11,826)	(12,858)
Other	(16,988)us-gaap_DeferredTaxAssetsOther	(15,623)us-gaap_DeferredTaxAssetsOther
Gross deferred tax assets	(28,814)us-gaap_DeferredTaxAssetsGross	(28,481)us-gaap_DeferredTaxAssetsGross
Valuation allowances	400	306
Deferred tax assets, net of valuation allowances	(28,414)us-gaap_DeferredTaxAssetsNet	(28,175)us-gaap_DeferredTaxAssetsNet
Net deferred tax liabilities	$ 39,758us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 47,502us-gaap_DeferredTaxAssetsLiabilitiesNet

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

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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 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 intangible assets other than goodwill.

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