Commitments and Contingencies - Asbestos Claimant and Settlement (Details) - Asbestos [Member]	9 Months Ended	12 Months Ended
	Sep. 30, 2017 USD ($) claimants	Dec. 31, 2016 USD ($) claimants	Dec. 31, 2015 claimants
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number		5,339	6,242
Loss Contingency, New Claims Filed, Number	128	140
Loss Contingency, Claims Dismissed, Number	180	1,009
Loss Contingency, Claims Settled, Number	22	34
Average settlement amount per claim during period | $	$ 5,375	$ 15,624
Total defense costs during period | $	$ 1,697,400	$ 2,920,000