LEASES AND RELATED PARTY LEASES - Narrative (Details)	6 Months Ended		12 Months Ended
	Jun. 30, 2019 USD ($) renewal_option	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Operating Leased Assets [Line Items]
Number of renewal options (or more) | renewal_option	1
Operating lease expense	$ 9,000,000.0	$ 6,500,000
Right of use asset - operating leases	97,783,000
Operating lease liability	107,645,000
Total payments over lease term, new operating lease	156,026,000
Operating lease expense, Topic 840			$ 16,300,000
Future minimum lease payments, capital leases			$ 0
NEW JERSEY
Operating Leased Assets [Line Items]
Operating lease, term			18 years
Right of use asset - operating leases	35,600,000
Operating lease liability	35,600,000
Related Parties
Operating Leased Assets [Line Items]
Operating lease expense	100,000	$ 100,000
Total payments over lease term, new operating lease	$ 3,056,000
Operating lease expense, Topic 840			$ 300,000
Percent of manufacturing facility owned by corporation whose shareholders are trusts whose beneficiaries include family members of company's former director	50.00%
Annual rate of lease agreement	$ 300,000
Related Parties | Five Year Option Lease From November 1, 2032 Through October 31, 2037
Operating Leased Assets [Line Items]
Option to extend lease, years	5 years
Period for extended lease	November 1, 2032 through October 31, 2037
Related Parties | Five Year Option Lease From November 1, 2037 Through October 31, 2042
Operating Leased Assets [Line Items]
Option to extend lease, years	5 years
Period for extended lease	November 1, 2037 through October 31, 2042