SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING STANDARDS - Deferred Offering Costs (Details) - USD ($) $ in Thousands		3 Months Ended
	Feb. 14, 2018	Mar. 31, 2018	Mar. 31, 2017
Deferred Financial Institution Costs [Roll Forward]
Deferred offering costs		$ 3,144	$ 0
Deferred costs incurred during period		1,135	776
Issuance costs	$ (4,300)	(4,279)	0
Deferred offering costs		0	$ 776
Deferred offering costs, unpaid		$ 700