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Investments (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Investment balances    
Cost $ 63,788us-gaap_TradingSecuritiesCost $ 79,488us-gaap_TradingSecuritiesCost
Gross Unrealized Gains 296us-gaap_TradingSecuritiesUnrealizedHoldingGain 243us-gaap_TradingSecuritiesUnrealizedHoldingGain
Gross Unrealized Losses (45)us-gaap_TradingSecuritiesUnrealizedHoldingLoss (111)us-gaap_TradingSecuritiesUnrealizedHoldingLoss
Estimated Market Value 64,039us-gaap_TradingSecurities 79,620us-gaap_TradingSecurities
U.S. Government and Government Agency Obligations    
Investment balances    
Cost 30,293us-gaap_TradingSecuritiesCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember		 66,761us-gaap_TradingSecuritiesCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
Gross Unrealized Gains 17us-gaap_TradingSecuritiesUnrealizedHoldingGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember		 20us-gaap_TradingSecuritiesUnrealizedHoldingGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
Gross Unrealized Losses (1)us-gaap_TradingSecuritiesUnrealizedHoldingLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember		 (8)us-gaap_TradingSecuritiesUnrealizedHoldingLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
Estimated Market Value 30,309us-gaap_TradingSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember		 66,773us-gaap_TradingSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
Money Market Funds    
Investment balances    
Cost 26,332us-gaap_TradingSecuritiesCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_MoneyMarketFundsMember		 8,250us-gaap_TradingSecuritiesCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_MoneyMarketFundsMember
Estimated Market Value 26,332us-gaap_TradingSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_MoneyMarketFundsMember		 8,250us-gaap_TradingSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_MoneyMarketFundsMember
Equity Funds    
Investment balances    
Cost 7,163us-gaap_TradingSecuritiesCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquityFundsMember		 4,477us-gaap_TradingSecuritiesCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquityFundsMember
Gross Unrealized Gains 279us-gaap_TradingSecuritiesUnrealizedHoldingGain
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquityFundsMember		 223us-gaap_TradingSecuritiesUnrealizedHoldingGain
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquityFundsMember
Gross Unrealized Losses (44)us-gaap_TradingSecuritiesUnrealizedHoldingLoss
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquityFundsMember		 (103)us-gaap_TradingSecuritiesUnrealizedHoldingLoss
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquityFundsMember
Estimated Market Value $ 7,398us-gaap_TradingSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquityFundsMember		 $ 4,597us-gaap_TradingSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquityFundsMember