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Long-Term Debt (Details 3) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Aggregate annual maturities of long-term debt    
2012 $ 72,629us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths  
2013 57,914us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo  
2014 75,791us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree  
2015 116,878us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour  
2016 72,723us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive  
Thereafter 685,532us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive  
Total Debt $ 1,081,467us-gaap_DebtLongtermAndShorttermCombinedAmount $ 699,078us-gaap_DebtLongtermAndShorttermCombinedAmount