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Fair Value Measurement - Fair Value of Assets (Liabilities) Not Measured at Fair Value In Consolidated Balance Sheets (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Level 2 | Long-term Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long term debt, fair value $ (425,999)us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_LongTermDebtMember		 [1] $ (429,049)us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_LongTermDebtMember		 [1]
Level 3 | Debt Securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value $ 20,724us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [2] $ 21,311us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [2]
[1] The fair value of fixed-rate long-term debt is estimated using the present value of underlying cash flows discounted at a current market yield for similar instruments. The carrying value of fixed-rate long term debt was $400.0 million at March 31, 2015 and December 31, 2014.
[2] The Perfect Home notes were initially valued at cost. The Company periodically reviews the valuation utilizing company-specific transactions or changes in Perfect Home’s financial performance to determine if fair value adjustments are necessary.