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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Statement of Financial Position [Abstract]    
Account Receivable, allowances aggregating $ 25,661us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 18,106us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Closure and post-closure liabilities, current portion 4,999us-gaap_AccruedCappingClosurePostClosureAndEnvironmentalCosts 5,884us-gaap_AccruedCappingClosurePostClosureAndEnvironmentalCosts
Remedial liabilities, current portion $ 17,092us-gaap_AccruedEnvironmentalLossContingenciesCurrent $ 23,587us-gaap_AccruedEnvironmentalLossContingenciesCurrent
Common stock, par value (in dollars per share) $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, authorized shares 80,000,000us-gaap_CommonStockSharesAuthorized 80,000,000us-gaap_CommonStockSharesAuthorized
Common stock, issued shares 58,903,482us-gaap_CommonStockSharesIssued 60,672,180us-gaap_CommonStockSharesIssued
Common stock, outstanding shares 58,903,482us-gaap_CommonStockSharesOutstanding 60,672,180us-gaap_CommonStockSharesOutstanding