RELATED-PARTY TRANSACTIONS - Deferred Compensation (Details) - USD ($) $ in Thousands	1 Months Ended
Apr. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Related Party Transactions [Abstract]
Deferred compensation		$ 4,112	$ 27,322
Distributions	$ 23,300

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

No definition available.

Name:	us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant