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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 $ 512,060,000us-gaap_Goodwill $ 514,426,000us-gaap_Goodwill $ 444,084,000us-gaap_Goodwill
Long-term Debt 415,125,000us-gaap_LongTermDebt    
Advertising costs 4,800,000us-gaap_AdvertisingExpense 4,000,000us-gaap_AdvertisingExpense 3,300,000us-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