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Accumulated Other Comprehensive Loss (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Net of income taxes    
Realized gain/(loss) on sale of marketable securities $ (7)us-gaap_MarketableSecuritiesGainLoss $ (494)us-gaap_MarketableSecuritiesGainLoss
Income tax (expense) benefit 195us-gaap_IncomeTaxExpenseBenefit 279us-gaap_IncomeTaxExpenseBenefit
Net of income taxes (5,032)us-gaap_ProfitLoss (3,776)us-gaap_ProfitLoss
Components of AOCI    
Net of income taxes    
Realized gain/(loss) on sale of marketable securities (11)us-gaap_MarketableSecuritiesGainLoss
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
 
Income tax (expense) benefit 0us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
 
Net of income taxes $ (11)us-gaap_ProfitLoss
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember