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Debt (Details 2) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Total $ 158,037 $ 158,171
Unsecured Debt [Member]    
Total Principal 159,114 159,304
Unamortized debt issuance costs (1,077) (1,133)
Total 158,037 158,171
Unsecured Debt [Member] | 2019 Term Loan [Member]    
Debt Instrument, Face Amount 19,114 19,304
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