CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Allowance for Doubtful Accounts Receivable, Current	$ 13,531	$ 11,125
Accrued Capping, Closure, Post-closure and Environmental Costs	3,683	8,791
Accrued Environmental Loss Contingencies, Current	$ 17,892	$ 15,330
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	80,000,000	80,000,000
Common Stock, Shares, Issued	60,491,452	60,385,453
Common Stock, Shares, Outstanding	60,491,452	60,385,453