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Debt and Credit Facilities Credit Facility (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Sep. 30, 2018
Apr. 15, 2016
Line of Credit Facility [Line Items]      
Debt Issuance Costs, Noncurrent, Net $ 760 $ 843  
Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity 235,600   $ 242,500
Letters of Credit Outstanding, Amount $ 6,900