DEFERRED COMPENSATION EXPENSE (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Additional disclosures
Deferred compensation expense	$ 911	$ 799
TMS
Additional disclosures
Deferred compensation expense	$ 900	700
TMS \| Restricted phantom units
Additional disclosures
Vesting (as a percent)	50.00%
TMS \| Restricted phantom units \| Tranche One
Additional disclosures
Earlier vesting, age threshold (in years)	60 years
TMS \| Restricted phantom units \| Tranche Two
Additional disclosures
Earlier vesting, age threshold (in years)	55 years
Earlier vesting, length of service threshold (in years)	10 years
TMS \| Restricted phantom units \| Tranche Three
Additional disclosures
Earlier vesting, age threshold (in years)	50 years
Earlier vesting, length of service threshold (in years)	20 years
Long-term incentive plan
Additional disclosures
Deferred compensation expense	$ 0	$ 100

Represents the age threshold for accelerated vesting of share-based compensation awards.

No definition available.

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- Definition

Represents the length of service threshold for accelerated vesting of share-based compensation awards.

+ References

No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section S99
-Paragraph 1
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

+ References

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- References

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- Definition

Percentage of vesting of share-based compensation awards.

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