CONCENTRATION OF CREDIT RISK AND MAJOR CUSTOMERS (Tables)

12 Months Ended

Dec. 31, 2017

CONCENTRATION OF CREDIT RISK AND MAJOR CUSTOMERS

Schedule of total revenues from major customers

	Year Ended December 31,
	2016		2015
	(in thousands)
Customer A	$	253,465	$	343,483
Customer B		241,255		305,048
Customer C		265,642		312,150