Commitments and Contingencies - Litigation (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2016 USD ($) lawsuit	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Loss Contingencies [Line Items]
Gain on litigation settlement		$ 0	$ 0	$ 6,625
Prepaid expenses and other current assets		32,172	$ 35,282
2012 Departure of Key Leaders from Tyfo Fibrwrap
Loss Contingencies [Line Items]
Number of lawsuits settled | lawsuit	2
Gain on litigation settlement	$ 6,600
Period of time settlement payment is to be received	4 years
Initial cash payment received for settlement	$ 3,600
Cash installments for settlement	$ 750
Remaining, settlement payment	4 years
Prepaid expenses and other current assets		750
Other assets		$ 1,500