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Income Taxes Valuation allowance (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Valuation Allowance [Line Items]    
Valuation allowance, amount $ 14,793us-gaap_DeferredTaxAssetsValuationAllowance $ 12,194us-gaap_DeferredTaxAssetsValuationAllowance
State net operating loss [Member]    
Valuation Allowance [Line Items]    
Increase for state net operating losses $ 2,599us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOperatingLossCarryforwardsMember