Discontinued Operations - Assets and Liabilities of Discontinued Operations (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total current assets	$ 0	$ 42,500
Total assets	0	93,707
Total current liabilities	0	16,236
Other long-term liabilities	$ 0	5,548
Matane Plant | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accounts receivable, net		23,093
Inventory		17,349
Prepaid and other current assets		2,058
Total current assets		42,500
Property, plant and equipment, net		17,482
Deferred tax assets		31,486
Other assets		2,239
Total assets		93,707
Accounts payable		11,035
Accrued and other current liabilities		3,786
Other current liabilities		1,415
Total current liabilities		16,236
Other long-term liabilities		5,548
Total liabilities		$ 21,784