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SEGMENT AND GEOGRAPHICAL REPORTING, Geographical Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Revenues	$ 1,241,510	$ 1,097,110	$ 807,005
Property and equipment, net	58,253	58,713
UNITED STATES [Member]
Segment Reporting Information [Line Items]
Revenues	1,075,962	1,039,712	807,005
Property and equipment, net	32,878	31,334
CANADA [Member]
Segment Reporting Information [Line Items]
Revenues	165,548	57,398	0
Property and equipment, net	$ 25,375	$ 27,379

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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