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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