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Debt (Schedule of Minimum Principal Payments) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]  
2018 $ 9,926
2019 32,000
2020 75,000
Total 116,926
Line of Credit  
Debt Instrument [Line Items]  
2018 0
2019 32,000
2020 75,000
Total 107,000
Notes Payable  
Debt Instrument [Line Items]  
2018 9,926
2019 0
2020 0
Total $ 9,926