Commitments and Contingencies - Narrative - Legal Matters (Details)			1 Months Ended	3 Months Ended		12 Months Ended
	Mar. 23, 2016 USD ($) LegalMatter	Apr. 03, 2013 USD ($)	Dec. 31, 2015 USD ($)	Mar. 31, 2016 USD ($) LegalMatter	Feb. 28, 2015 USD ($)	Nov. 30, 2015 USD ($)	Nov. 30, 2011 USD ($) LegalMatter plantiff	Jan. 16, 2015 USD ($) citation	Dec. 18, 2014 USD ($)	Nov. 30, 2013 employee
Loss Contingencies [Line Items]
Legal fees and expenses (less than $0.5 million - 3/23/16)			$ 400,000	$ (100,000)	$ (700,000)
Asbestos Litigation [Member]
Loss Contingencies [Line Items]
Unresolved asbestos cases pending | LegalMatter				68
Accrued estimated liability						$ 0
Asbestos Litigation [Member] | AMEC PLC [Member]
Loss Contingencies [Line Items]
Unresolved asbestos cases pending | LegalMatter	52						16
Number of plaintiffs | plantiff							271
Reimbursement of legal fees and expenses							$ 1,700,000
Legal fees and expenses (less than $0.5 million - 3/23/16)	$ 500,000	$ 3,000,000
Litigation liability accrued				$ 200,000
Expenditures recoverable						0
Inflective Inc. Litigation [Member] | Inflective, Inc. [Member]
Loss Contingencies [Line Items]
Litigation liability accrued						0
Damages									$ 3,000,000
Socorro Litigation [Member] | James Chavez, Andrew Baca, and Spouses [Member]
Loss Contingencies [Line Items]
Litigation liability accrued						$ 0
Occupational Safety [Member] | State of California, Division of Occupational Safety & Health [Member] | Rancho Cordova Facility [Member]
Loss Contingencies [Line Items]
Damages								$ 100,000
Number of injured employees | employee										2
Number of deceased employees | employee										1
Number of citations | citation								9