Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Narrative) (Details)

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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]    
Outstanding performance and payment bonds $ 8.3 $ 8.3
Estimated costs to complete projects secured by performance and payment bonds $ 2.7 $ 4.4