INCOME TAXES - Income Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reconciliation of federal statutory tax rate with effective tax rate
Federal statutory tax rate	21.00%	21.00%	21.00%
Impact on deferred taxes for changes in tax rates	(0.40%)	(0.30%)	0.90%
Additional deferred tax adjustments	(0.10%)	(0.10%)	0.80%
State income taxes, net of federal income tax benefit	5.10%	4.40%	(3.40%)
Foreign rates varying from federal statutory tax rate	(5.30%)	0.10%	1.30%
FMS U.K. business exit	3.20%	0.00%	0.00%
Tax contingencies	(0.30%)	(0.70%)	5.50%
Tax credits	(0.20%)	(0.30%)	1.70%
Other permanent book-tax differences	0.60%	1.80%	(3.30%)
Change in foreign valuation allowance	5.40%	(1.10%)	(11.90%)
Other	0.10%	(0.10%)	1.50%
Effective tax rate	29.10%	24.70%	14.10%