Discontinued Operations and Assets Held for Sale - Major Categories of Assets and Liabilities Reflected as Held for Sale (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Current liabilities
Total current liabilities associated with assets held for sale	$ 13,298	$ 13,298	$ 286,458	[1]
Non-current liabilities
Total non-current liabilities associated with assets held for sale	0	0	392,720	[1]
Discontinued Operations, Held-for-sale or Disposed of by Sale
Current assets
Cash	25,185	25,185	44,669
Accounts receivable	4,834	4,834	103,158
Inventories	406	406	7,887
Prepaid expenses and other	1,882	1,882	18,151
Property, Plant, and Equipment, net	82,116	82,116	0
Deferred income taxes and other assets	9,441	9,441	0
Total current assets associated with assets held for sale	123,864	123,864	173,865
Non-current assets
Property, Plant, and Equipment, net	0	0	1,325,431
Deferred income taxes and other assets	0	0	219,577
Total non-current assets associated with assets held for sale	0	0	1,545,008
Current liabilities
Accounts payable	3,702	3,702	203,236
Other accrued liabilities	0	0	55,273
Current maturities of long-term debt (finance lease)	705	705	9,915
Taxes payable	1,411	1,411	18,034
Asset retirement obligation	240	240	0
Long-term debt (finance lease)	7,240	7,240	0
Total current liabilities associated with assets held for sale	13,298	13,298	286,458
Non-current liabilities
Long-term debt	0	0	117,816
Asset retirement obligation	0	0	274,904
Total non-current liabilities associated with assets held for sale	0	0	$ 392,720
Malaysia
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposition of business	$ 985,400	$ 985,400

[1] Reclassified to conform with current presentation (see Note E)