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Debt and Credit Facilities - Schedule of Long Term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Long-Term Debt issuance costs $ (694) $ (836)
Total long-term 249,306 429,164
Revolving Credit Facility    
Debt Instrument [Line Items]    
Long-term debt 0 180,000
Senior Notes    
Debt Instrument [Line Items]    
Long-term debt $ 250,000 $ 250,000