Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12355-112629

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12317-112629

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Name:	us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

DEBT - 2015 Term Loan Facility (Details) - USD ($)	1 Months Ended	12 Months Ended
DEBT - 2015 Term Loan Facility (Details) - USD ($)	May 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Aug. 31, 2015
Debt Instrument [Line Items]
Loss on debt extinguishment		$ 0	$ 35,922,000	$ 10,926,000
Line of Credit \| 2015 Term Loan Facility
Debt Instrument [Line Items]
Maximum borrowing capacity					$ 350,000,000.0
Loss on debt extinguishment	$ 9,700,000