Liabilities for Disposed Operations - Site Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance	$ 160,654	$ 164,086
Payments	(6,444)	(11,966)
Increase (Decrease) to Liabilities	17,166	8,534
Ending balance	171,376	160,654
Less: Current portion	(11,339)	(11,310)	$ (13,181)
Non-Current portion	160,037	149,344	$ 150,905
Increase (decrease) in liabilities from foreign currency translation gains	(1,000)	(1,000)
Port Angeles, Washington
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance	44,799	43,667
Payments	(1,404)	(935)
Increase (Decrease) to Liabilities	11,045	2,067
Ending balance	54,440	44,799
Augusta, Georgia
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance	20,354	21,175
Payments	(683)	(929)
Increase (Decrease) to Liabilities	1,876	108
Ending balance	21,547	20,354
Baldwin, Florida
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance	17,244	21,170
Payments	(450)	(4,613)
Increase (Decrease) to Liabilities	383	687
Ending balance	17,177	17,244
All other sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance	78,257	78,074
Payments	(3,907)	(5,489)
Increase (Decrease) to Liabilities	3,862	5,672
Ending balance	$ 78,212	$ 78,257