ACCOUNTING POLICIES - Adoption of New Lease Standard (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019
Accounting Policies [Line Items]
Operating lease liability	$ 41,834
Operating lease right-of-use assets	$ 37,262
Accounting Standards Update 2016-02
Accounting Policies [Line Items]
Operating lease liability		$ 35,100
Operating lease right-of-use assets		31,000
Deferred rent offset to right-of-use asset		$ 4,200