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Fair Value Measurements Fair Value Measurements (Fair Value of Marketable Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Fair Value Measurements    
Estimated fair value of marketable securities $ 16,656us-gaap_InvestmentsFairValueDisclosure $ 15,378us-gaap_InvestmentsFairValueDisclosure
Fair value, inputs, Level 1 [Member]    
Fair Value Measurements    
Estimated fair value of marketable securities 16,656us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 15,378us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Fair value, inputs, Level 2 [Member]    
Fair Value Measurements    
Estimated fair value of marketable securities 0us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 0us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Fair value, inputs, Level 3 [Member]    
Fair Value Measurements    
Estimated fair value of marketable securities $ 0us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 $ 0us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member