Contingencies (Details) - Threatened Litigation [Member] $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($)
Loss Contingencies [Line Items]
Loss Contingency, Management's Assessment and Process	In October 2016, the Company learned that the trustee in the GTAT bankruptcy proceedings filed adversary actions against three of the Company’s subsidiaries to recover payments aggregating approximately $4.4 million, which were received by the subsidiaries during the 90 days preceding GTAT’s bankruptcy filing, on the premise that such payments were made during the preference period and therefore may be avoidable as preferential or constructively fraudulent, among other theories. These adversary actions are subject to mandatory mediation procedures by order of the bankruptcy court. The Company believes that the payments were made in the ordinary course of business, and, although the outcome cannot be predicted at this time, the Company intends to vigorously defend against the claims.
GTAT bankruptcy trustee [Member]
Loss Contingencies [Line Items]
Loss Contingency, Lawsuit Filing Date	10/1/2016
Loss Contingency, Estimate of Possible Loss	$ 4.4