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SEGMENT REPORTING - REVENUE, PROPERTY, PLANT AND EQUIPMENT AND INTANGIBLE ASSETS OUTSIDE OF THE UNITED STATES (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Property, plant and equipment, net	$ 903,947,000	$ 655,394,000
Permits and other intangibles, net	139,644,000	114,400,000
United States and Puerto Rico [Member]
Revenue for reportable segment	1,149,400,000	1,144,100,000	787,900,000
Segment reporting information revenue percent	57.90%	66.10%	73.30%
Canada
Revenue for reportable segment	833,600,000	586,400,000	285,700,000
Segment reporting information revenue percent	42.00%	33.90%	26.60%
Property, plant and equipment, net	509,600,000	351,700,000
Permits and other intangibles, net	$ 74,900,000	$ 62,500,000
Property Plant And Equipment Net Percent	56.40%	53.70%
Intangible Assets Net Excluding Goodwill Percent	53.70%	54.60%
Other International Locations [Member]
Segment reporting information revenue percent		1.00%
Mexico [Member]
Segment reporting information revenue percent			1.00%

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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