ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred income tax	$ 2,670	$ 60,280	$ 92,905
Retained earnings	3,914,645	$ 2,928,226
ASU 2016-16 | Adjustment
Deferred income tax	(6,600)
Retained earnings	$ 6,600