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Debt and Contingent Obligations - Maturity of Long Term Debt (Details) - Secured Debt
$ in Thousands
Sep. 30, 2019
USD ($)
June 30, 2019 – September 30, 2020 | Term Loan A  
Debt Instrument [Line Items]  
Quarterly installment payments on term loans $ 1,000
December 31, 2020 | Term Loan A  
Debt Instrument [Line Items]  
Quarterly installment payments on term loans 1,250
March 31, 2020 – September 30, 2020 | Term Loan B  
Debt Instrument [Line Items]  
Quarterly installment payments on term loans 250
March 31, 2021 – December 30, 2022 | Term Loan B  
Debt Instrument [Line Items]  
Quarterly installment payments on term loans 1,125
March 31, 2023 – December 31, 2023 | Term Loan B  
Debt Instrument [Line Items]  
Quarterly installment payments on term loans $ 1,250