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Goodwill and Intangible Assets Intangibles (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 9 years 10 months 28 days  
Finite-Lived Intangible Assets, Gross $ 39,274 $ 39,662
Finite-Lived Intangible Assets, Accumulated Amortization (13,534) (13,039)
Intangible Assets, Net (Excluding Goodwill) 25,740 26,623
Trademarks and Trade Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 5,044 5,084
Finite-Lived Intangible Assets, Accumulated Amortization (1,328) (1,267)
Intangible Assets, Net (Excluding Goodwill) $ 3,716 $ 3,817
Trademarks and Trade Names [Member] | Minimum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 5 years 5 years
Trademarks and Trade Names [Member] | Maximum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 20 years 20 years
Technical Library    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 20 years 20 years
Finite-Lived Intangible Assets, Gross $ 400 $ 400
Finite-Lived Intangible Assets, Accumulated Amortization (126) (121)
Intangible Assets, Net (Excluding Goodwill) 274 279
Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 33,539 33,539
Finite-Lived Intangible Assets, Accumulated Amortization (11,825) (11,051)
Intangible Assets, Net (Excluding Goodwill) $ 21,714 $ 22,488
Customer Relationships [Member] | Minimum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 6 years 6 years
Customer Relationships [Member] | Maximum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 15 years 15 years
Noncompete Agreements [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 5 years 5 years
Finite-Lived Intangible Assets, Gross $ 40 $ 40
Finite-Lived Intangible Assets, Accumulated Amortization (11) (9)
Intangible Assets, Net (Excluding Goodwill) $ 29 $ 31
Backlog [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 1 year 1 year
Finite-Lived Intangible Assets, Gross $ 251 $ 599
Finite-Lived Intangible Assets, Accumulated Amortization (244) (591)
Intangible Assets, Net (Excluding Goodwill) $ 7 $ 8
Construction Contracts [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 1 year 1 year