Commitments and Contingencies Asbestos Claimant and Settlement (Details) - Asbestos [Member]	6 Months Ended	12 Months Ended
	Jun. 30, 2019 USD ($) claimants	Dec. 31, 2018 USD ($) claimants	Dec. 31, 2017 claimants
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number	4,806	4,820	5,256
Loss Contingency, New Claims Filed, Number	70	171
Loss Contingency, Claims Dismissed, Number	75	564
Loss Contingency, Claims Settled, Number	9	43
Average settlement amount per claim during period | $	$ 34,856	$ 7,191
Total defense costs during period | $	$ 1,184,000	$ 2,260,000