Liabilities for Dispositions and Discontinued Operations Schedule of Change in Environmental Loss Contingencies (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 charged to liabilities	(8,570)	(9,926)	(9,209)
Increase to liabilities	3,253	797	6,873
Ending balance	76,378	81,695	90,824
Less: Current portion	(6,835)	(8,105)	(9,931)
Non-current portion	$ 69,543	$ 73,590	$ 80,893