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Earnings per Share (Calculation of the Weighted Average Number of Shares Outstanding) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Earnings Per Share [Abstract]                      
Document Fiscal Year Focus                 2018    
Loss available for distribution                 $ (37,932) $ (13,378) $ (49,120)
Weighted average number of shares                      
Basic shares outstanding                 25,115 24,712 24,313
Dilutive effect related to employee stock plans                 0 0 0
Diluted shares outstanding                 25,115 24,712 24,313
Net loss per share - basic (in dollars per share) $ (0.49) $ (0.52) $ (0.40) $ (0.10) $ (0.08) $ (0.21) $ (0.12) $ (0.12) $ (1.51) $ (0.54) $ (2.02)
Net loss per share - diluted (in dollars per share) $ (0.49) $ (0.52) $ (0.40) $ (0.10) $ (0.08) $ (0.21) $ (0.12) $ (0.12) $ (1.51) $ (0.54) $ (2.02)