EMPLOYEE BENEFIT PLANS - Schedule of Fair Value of Plan Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	$ 94,164	$ 94,962	$ 83,086
UK Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	94,281	94,961
UK Pension Plan | Quoted Prices in Active Markets  for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	2,411	15,600
UK Pension Plan | Significant Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	91,870	79,361
UK Pension Plan | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
UK Pension Plan | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	2,411	15,600
UK Pension Plan | Cash | Quoted Prices in Active Markets  for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	2,411	15,600
UK Pension Plan | Cash | Significant Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
UK Pension Plan | Cash | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
UK Pension Plan | Diversified Growth Fund
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	23,582	22,640
UK Pension Plan | Diversified Growth Fund | Quoted Prices in Active Markets  for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
UK Pension Plan | Diversified Growth Fund | Significant Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	23,582	22,640
UK Pension Plan | Diversified Growth Fund | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
UK Pension Plan | Global Equity Fund
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	2,922
UK Pension Plan | Global Equity Fund | Quoted Prices in Active Markets  for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
UK Pension Plan | Global Equity Fund | Significant Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	2,922
UK Pension Plan | Global Equity Fund | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
UK Pension Plan | Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	9,487	17,478
UK Pension Plan | Fixed Income Securities | Quoted Prices in Active Markets  for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
UK Pension Plan | Fixed Income Securities | Significant Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	9,487	17,478
UK Pension Plan | Fixed Income Securities | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
UK Pension Plan | Government Index Linked Securities
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	16,393	15,331
UK Pension Plan | Government Index Linked Securities | Quoted Prices in Active Markets  for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
UK Pension Plan | Government Index Linked Securities | Significant Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	16,393	15,331
UK Pension Plan | Government Index Linked Securities | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
UK Pension Plan | Global Absolute Return Bond Fund
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	12,111	12,235
UK Pension Plan | Global Absolute Return Bond Fund | Quoted Prices in Active Markets  for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
UK Pension Plan | Global Absolute Return Bond Fund | Significant Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	12,111	12,235
UK Pension Plan | Global Absolute Return Bond Fund | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
UK Pension Plan | Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	30,297	8,755
UK Pension Plan | Corporate Bonds | Quoted Prices in Active Markets  for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
UK Pension Plan | Corporate Bonds | Significant Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	30,297	8,755
UK Pension Plan | Corporate Bonds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	$ 0	$ 0