Goodwill and Other Intangible Assets - Changes in carrying value of goodwill (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Line Items]
Goodwill impairment	$ 0	$ 0	$ 0
Gross Amount
Adjustment of goodwill acquired in the Fibermark Acquisition (1)	(400,000)
Net
Balance at the beginning of the period	72,200,000	50,500,000
Goodwill acquired in acquisition of the Fibemark		25,500,000
Foreign currency translation	(1,400,000)	(3,800,000)
Adjustment of goodwill acquired in the Fibermark Acquisition (1)	(400,000)
Balance at the end of the period	$ 70,400,000	72,200,000	50,500,000
Minimum
Goodwill [Line Items]
Useful lives	10 years
Maximum
Goodwill [Line Items]
Useful lives	15 years
Technical Products
Gross Amount
Balance at the beginning of the period	$ 110,700,000	100,800,000
Goodwill acquired in acquisition		18,900,000
Adjustment of goodwill acquired in the Fibermark Acquisition (1)	(400,000)
Foreign currency translation	(2,900,000)	(9,000,000)
Balance at the end of the period	107,400,000	110,700,000	100,800,000
Accumulated Impairment Losses
Balance at the beginning of the period	(45,100,000)	(50,300,000)
Foreign currency translation	1,500,000	5,200,000
Balance at the end of the period	(43,600,000)	(45,100,000)	(50,300,000)
Net
Balance at the beginning of the period	65,600,000	50,500,000
Goodwill acquired in acquisition of the Fibemark		18,900,000
Foreign currency translation	(1,400,000)	(3,800,000)
Adjustment of goodwill acquired in the Fibermark Acquisition (1)	(400,000)
Balance at the end of the period	63,800,000	65,600,000	50,500,000
Fine Paper and Packaging
Gross Amount
Balance at the beginning of the period	6,200,000	0
Goodwill acquired in acquisition		6,200,000
Balance at the end of the period	6,200,000	6,200,000	0
Other
Gross Amount
Balance at the beginning of the period	400,000	0
Goodwill acquired in acquisition		400,000
Balance at the end of the period	$ 400,000	$ 400,000	$ 0