COMMITMENTS AND CONTINGENCIES (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Schedule of future minimum payments under non-cancelable operating and capital leases

At December 31, 2017, future minimum payments under non-cancelable operating leases are as follows:

Year Ended December 31,	Operating Leases
	(in thousands)
2018	$	23,028
2019	18,453
2020	14,740
2021	12,950
2022	9,648
Thereafter	60,091
Total minimum lease payments	$	138,910

Purchase commitment, excluding long-term commitment

At December 31, 2017, the Company had the following non-cancelable purchase commitments:

Year Ended December 31,	Purchase Commitments
	(in thousands)
2018	$	153,358
2019	2,447
2020	544
2021	542
2022	536
Thereafter	—
Total purchase commitments	$	157,427