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Debt (Details 2) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Total $ 158,305 $ 158,679
Unsecured Debt [Member]    
Total Principal 159,495 160,044
Unamortized debt issuance costs (1,190) (1,365)
Total 158,305 158,679
Unsecured Debt [Member] | 2019 Term Loan [Member]    
Debt Instrument, Face Amount 19,495 20,044
Unsecured Debt [Member] | 2023 Term Loan [Member]    
Debt Instrument, Face Amount 40,000 40,000
Unsecured Debt [Member] | 2024 Term Loan [Member]    
Debt Instrument, Face Amount $ 100,000 $ 100,000