Commitments and Contingencies - Narrative (Details) $ in Millions	3 Months Ended			12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2018 CAD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2018 CAD ($)	Jul. 31, 2017 USD ($)	Jul. 07, 2016 USD ($)
Loss Contingencies [Line Items]
Operating leases rent expense				$ 6,800,000	$ 5,800,000	$ 5,400,000
Rochester, New Hampshire
Loss Contingencies [Line Items]
Environmental remediation expense			$ 200,000	100,000
Texel | Quebec, Canada
Loss Contingencies [Line Items]
Indemnification assets, mimimum estimated outcome									$ 900,000
Indemnification assets, maximum estimated outcome								$ 1,500,000	$ 1,500,000
Environment remediation indemnity secured by environmental escrow account	$ 2,200,000			2,200,000			$ 3.0
Environmental remediation indemnity secured by general escrow account	10,300,000			10,300,000			14.0
Environmental remediation indemnity secured by general escrow account, reduced amount after share purchase agreement	5,100,000			5,100,000			$ 7.0
Environmental Contamination | Rochester, New Hampshire
Loss Contingencies [Line Items]
Accrual for environmental liability, including revision (fully offset)	0			0
Environmental remediation expense				200,000
Environmental Contamination | Texel | Quebec, Canada
Loss Contingencies [Line Items]
Reduction to accrual for environmental liability, payments				800,000	700,000
Accrual for environmental liability, including revision (fully offset)	0			0	$ 800,000			$ 1,500,000
Accrual for environmental liability, revision of estimate				(800,000)
Environmental liability	0			$ 0		$ 900,000
Increase (decrease) in accrual for environmental liability	$ (900,000)	$ (1.2)