OPERATING SEGMENTS (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Revenue, Property and Equipment and Intangible Assets Outside of the United States
Total revenue	$ 53,090	$ 45,739	$ 141,766	$ 118,732
Total long- lived assets	153,638		153,638		150,563
United States
Revenue, Property and Equipment and Intangible Assets Outside of the United States
Total revenue	37,833	36,100	101,852	91,658
Total long- lived assets	86,851		86,851		81,605
Canada
Revenue, Property and Equipment and Intangible Assets Outside of the United States
Total revenue	15,257	9,639	39,914	27,074
Total long- lived assets	$ 66,787		$ 66,787		$ 68,958