COMMITMENTS AND CONTINGENCIES (Details)			3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended				12 Months Ended	3 Months Ended	12 Months Ended	21 Months Ended	12 Months Ended	1 Months Ended			3 Months Ended			12 Months Ended
	Jun. 30, 2011 USD ($)	Dec. 31, 2010 USD ($)	Jun. 30, 2011 Legal and Administrative Proceedings USD ($)	Dec. 31, 2010 Legal and Administrative Proceedings USD ($)	Jun. 30, 2011 Ville Mercier CAD	Dec. 31, 1999 Ville Mercier	Dec. 31, 1968 Ville Mercier	Jun. 30, 2011 Ville Mercier USD ($)	Dec. 31, 2010 Ville Mercier USD ($)	Dec. 31, 2006 Deer Trail, Colorado Facility	Jun. 30, 2011 Superfund Proceedings	Dec. 31, 2002 Superfund Proceedings	May 31, 2006 Superfund Proceedings	Dec. 31, 2002 Wichita Property	May 31, 2007 Casmalia Site	Jun. 30, 2011 Marine Shale Site USD ($)	Dec. 31, 2010 Marine Shale Site USD ($)	Jun. 30, 2011 Certain Other Third Party Sites USD ($)	Jun. 30, 2011 Federal and State Enforcement Actions USD ($)	Dec. 31, 2010 Federal and State Enforcement Actions	Dec. 31, 2010 Other Contingencies USD ($)
Legal and Administrative Proceedings
Reserves relating to legal and administrative proceedings	$ 29,600,000	$ 29,700,000	$ 27,500,000
Reserves relating to legal and administrative proceedings																			2,100,000
Possible increase in legal and administrative proceedings			2,700,000	2,800,000
Number of permits issued by government, for dumping inorganic liquid							2
Number of neighboring municipalities filing separate legal proceedings against the Mercier Subsidiary and the Government of Quebec						3
Number of municipalities filing separate legal proceedings, total					4
Damages claimed by municipalities					1,600,000
Suit against alleged past costs					17,400,000
Accrued remedial liabilities	137,172,000	137,613,000						14,300,000	13,500,000
Number of lawsuits filed										2
Superfund Proceedings
Number of sites subject to proceedings under federal or state superfund laws											62
Number of sites owned by the entity subject to proceedings under federal or state superfund laws											2
Number of sites owned by third parties subject to proceedings under federal or state Superfund laws												60
Third party sites arising out of acquisition of assets												35
Third party sites requiring expenditure on remediation											12
Third party sites requiring expenditure on remediation being contested by the entity											1
Number of sites for which environmental remediation expense is settled											10
Number of sites for which environmental remediation expense is not required											13
Number of sites owned by third party excluded from cleanup or related liabilities											2
State-designated superfund site acquired, total acres														1,400
Notices received from owners of third party sites seeking indemnification from the company													5
Third party sites where EPA requested information on prior owner															1
Remaining reserves relating to listed third party sites																3,800,000	3,800,000
Indemnification agreement with third party sites																		14
Additional cleanup liabilities, maximum																		100,000
Federal and State Enforcement Actions
Number of proceedings relating to waste treatment																			2	3
Sanctions relating to waste treatment																			100,000
Other Contingencies
Payment to acquire minority interest in a privately-held company																					10,500,000
Proceeds from irrevocable call right exercised by the privately-held company on shares held																					$ 10,500,000