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Geographical Information (Narrative) (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
customers
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2015
USD ($)
customers
Sep. 30, 2014
USD ($)
customers
Sep. 30, 2013
USD ($)
customers
Oct. 22, 2014
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Number of customers | customers 4       4 3 3  
Percentage of long-lived assets located in the United States 38.00%       38.00% 47.00%    
Revision in estimated cash flows         $ (2,879)      
Decrease in property, plant, and equipment         (2,100)      
Asset retirement obligation, revision in estimated cash flows $ 0 $ 0 $ 0 $ 845 $ 845 $ 0 $ 0  
Customer Concentration Risk [Member] | Sales Revenue, Segment [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Revenue by customer, percentage         61.00% 41.00% 40.00%  
Digital Products Business [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Asset purchase agreement, selling price               $ 17,500