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Summary of Significant Accounting Policies (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Goodwill | $ 570,697,000us-gaap_Goodwill | $ 573,063,000us-gaap_Goodwill | $ 496,158,000us-gaap_Goodwill
Long-term Debt | 415,125,000us-gaap_LongTermDebt |  |
Advertising costs | 5,600,000us-gaap_AdvertisingExpense | 5,000,000us-gaap_AdvertisingExpense | 4,600,000us-gaap_AdvertisingExpense
Document Fiscal Year Focus | 2014 |  |
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Long-term debt, fair value | $ 414,800,000us-gaap_LongTermDebtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |

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