INCOME TAXES DEFERRED TAX ASSET AND LIABILITIES (Details) (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Components of Deferred Tax Assets [Abstract]
Workers compensation accrual	$ 4,961,000		$ 5,011,000
Provision for doubtful accounts	7,451,000		4,803,000
Closure, post-closure and remedial liabilities	52,382,000		31,082,000
Accrued expenses	20,102,000		13,635,000
Accrued compensation	5,000,000		2,279,000
Net operating loss carryforwards(1)	92,623,000	[1]	23,663,000	[1]
Tax credit carryforwards(2)	31,939,000	[2]	19,977,000	[2]
Uncertain tax positions accrued interest and federal benefit	350,000		11,462,000
Stock-based compensation	844,000		1,884,000
Other	1,121,000		4,421,000
Total deferred tax assets	216,773,000		118,217,000
Deferred tax liabilities:
Property, plant and equipment	(220,086,000)		(114,115,000)
Permits and customer databases	(155,214,000)		(20,547,000)
Total deferred tax liabilities	(375,300,000)		(134,662,000)
Deferred Tax Assets (Liabilities), Net	(158,527,000)		(16,445,000)
Less valuation allowance	(25,635,000)		(11,473,000)
Net deferred tax (liability) asset	(184,162,000)		(27,918,000)
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	150,100,000
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	212,100,000
Valuation Allowance, Amount	25,600,000		11,500,000		12,900,000
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	31,939,000
Income tax benefit related to stock option exercises	2,546,000		3,347,000		1,739,000
Restricted Stock [Member]
Deferred tax liabilities:
Increase (Decreade) Tax Benefit From Stock Options Exercised	8,500,000
Income tax benefit related to stock option exercises	5,900,000
2013
Deferred tax liabilities:
Valuation Allowance, Amount	4,656,000
2014
Deferred tax liabilities:
Valuation Allowance, Amount	3,603,000
2015
Deferred tax liabilities:
Valuation Allowance, Amount	889,000
2016
Deferred tax liabilities:
Valuation Allowance, Amount	1,164,000
2017
Deferred tax liabilities:
Valuation Allowance, Amount	1,192,000
Thereafter
Deferred tax liabilities:
Valuation Allowance, Amount	20,435,000
Foreign Country [Member]
Deferred tax liabilities:
Operating Loss Carryforwards	$ 53,900,000

[1] As of December 31, 2012, the net operating loss carryforwards included (i) state net operating loss carryovers of $150.1 million which begin to expire in 2019, (ii) federal net operating loss carryforwards of $212.1 million which begin to expire in 2025, and (iii) foreign net operating loss carryforwards of $53.9 million which begin to expire in 2026.

[2] As of December 31, 2012, foreign tax credit carryforwards of $31.9 million expire between 2013 and 2022 as follows:Years Ending December 31,ExpectedAmount2013$4,65620143,603201588920161,16420171,192Thereafter20,435 $31,939