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Notes Payable (Schedule of Maturities of Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Notes Payable [Abstract]  
2015 $ 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
2016 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
2017 140,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
2018 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
2019 $ 150,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive