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Credit Facility and Other Financing Arrangements - Bank Indebtedness (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
Credit Facility $ 20,000 $ 40,000
Deferred charges on debt financing (1,897) (2,247)
Total bank indebtedness $ 18,103 $ 37,753