Commitments and Contingencies - Litigation (Details) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2016 USD ($) lawsuit	Dec. 31, 2016 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Loss Contingencies [Line Items]
Gain on litigation settlement			$ 0	$ 6,625	$ 0
Prepaid expenses and other current assets	$ 51,832	$ 51,832	35,282	$ 51,832
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
First cash payment received for settlement			750
Cash installments for settlement	$ 750
Remaining, settlement payment	3 years
Prepaid expenses and other current assets			750
Other assets			$ 1,500