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SEGMENT AND GEOGRAPHICAL REPORTING, Geographical Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Revenues	$ 1,097,110	$ 807,005	$ 656,202
Property and equipment, net	58,713	16,911
UNITED STATES [Member]
Segment Reporting Information [Line Items]
Revenues	1,039,712	807,005	656,202
Property and equipment, net	31,334	16,911
CANADA [Member]
Segment Reporting Information [Line Items]
Revenues	57,398	0	0
Property and equipment, net	$ 27,379	$ 0

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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