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

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences from goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 740 -Section 25 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6912350&loc=d3e9979-128506 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 740 -Section 25 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6912350&loc=d3e9972-128506 + Details
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