Litigation (Details) - WesternGeco [Member]				1 Months Ended					12 Months Ended		36 Months Ended
	Jun. 30, 2017	May 16, 2017 USD ($)	Nov. 25, 2016 USD ($)	May 31, 2014 USD ($)	Apr. 30, 2014 USD ($)	Oct. 31, 2013 USD ($)	Aug. 31, 2012 USD ($)	Jun. 30, 2009 Patent	Dec. 31, 2018 USD ($) installment	Dec. 31, 2017 USD ($) installment	Jul. 02, 2015 USD ($)	Nov. 14, 2016 USD ($)	Nov. 13, 2016 USD ($)
Loss Contingencies [Line Items]
Number of patent apparatus claims contained | Patent								4
Pending Litigation [Member]
Loss Contingencies [Line Items]
Damages awarded				$ 123,800,000	$ 9,400,000	$ 73,100,000	$ 105,900,000
Reduction in damages award in the case					$ (3,000,000)
Prejudgment interest expense accrued											$ 10,900,000
Amount of appeal bond												$ 65,000,000	$ 120,000,000
Amount of royalty damages paid			$ 20,800,000
Pending Litigation [Member] | Lost Royalties [Member]
Loss Contingencies [Line Items]
Damages awarded							$ 12,500,000
Pending Litigation [Member] | Lost Profits [Member]
Loss Contingencies [Line Items]
Damages awarded											$ 93,400,000
Settled Litigation [Member]
Loss Contingencies [Line Items]
Damages awarded		$ 5,000,000
Period damages awarded to be paid	12 months
Settled Litigation [Member] | Forecast [Member]
Loss Contingencies [Line Items]
Amount of royalty damages paid									$ 3,750,000	$ 1,250,000
Number of installments damages awarded to be paid | installment									3	2
Amount of each installment for current year									$ 1,250,000	$ 625,000