Liabilities for Dispositions and Discontinued Operations Site Liabilities Rollforward (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance	$ 81,695	$ 90,824	$ 93,160
Expenditures	(8,570)	(9,926)	(9,209)
Increase (Reduction) to Liabilities	3,253	797	6,873
Ending balance	76,378	81,695	90,824
Total SWP sites [Member]
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance	67,000	75,600
Expenditures	(6,400)	(7,200)
Increase (Reduction) to Liabilities	2,300	(1,400)
Ending balance	62,900	67,000
Augusta, Georgia [Member]
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance	12,100	13,900
Expenditures	(1,000)	(800)
Increase (Reduction) to Liabilities	800	(1,000)
Ending balance	11,900	12,100
Spartanburg, South Carolina [Member]
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance	14,000	14,700
Expenditures	(1,400)	(900)
Increase (Reduction) to Liabilities	(800)	200
Ending balance	11,800	14,000
East Point, Georgia [Member]
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance	10,900	11,000
Expenditures	(800)	(1,000)
Increase (Reduction) to Liabilities	(200)	900
Ending balance	9,900	10,900
Baldwin, Florida [Member]
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance	9,100	9,700
Expenditures	(1,100)	(900)
Increase (Reduction) to Liabilities	2,700	300
Ending balance	10,700	9,100
Other SWP sites [Member]
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance	20,900	26,300
Expenditures	(2,100)	(3,600)
Increase (Reduction) to Liabilities	(200)	(1,800)
Ending balance	18,600	20,900
Port Angeles, Washington [Member]
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance	9,500	9,300
Expenditures	(1,500)	(1,700)
Increase (Reduction) to Liabilities	1,400	1,900	7,100
Ending balance	9,400	9,500	9,300
All other sites [Member]
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance	5,200	5,900
Expenditures	(700)	(1,000)
Increase (Reduction) to Liabilities	(400)	300
Ending balance	$ 4,100	$ 5,200