Contingencies (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Loss Contingencies [Line Items]
Reserve for environmental matters	$ 16,070
Environmental Issue
Loss Contingencies [Line Items]
Largest range for any one site	8,200
Environmental Issue | Minimum
Loss Contingencies [Line Items]
Estimated total liability for environmental sites	16,100
Environmental Issue | Maximum
Loss Contingencies [Line Items]
Estimated total liability for environmental sites	$ 80,100