COMMITMENTS AND CONTINGENT LIABILITIES - Schedule of Commitment Expiration (Details) $ in Thousands	Mar. 31, 2020 USD ($)
Guarantor Obligations [Line Items]
Total Amounts Committed	$ 744,408
Less Than 1 Year	653,781
1-3 Years	89,897
3-5 Years	398
Beyond 5 Years	332
Letters of Credit
Guarantor Obligations [Line Items]
Total Amounts Committed	110,799
Less Than 1 Year	76,886
1-3 Years	33,913
3-5 Years	0
Beyond 5 Years	0
Letters of Credit | Employee-Related
Guarantor Obligations [Line Items]
Total Amounts Committed	64,558
Less Than 1 Year	35,806
1-3 Years	28,752
3-5 Years	0
Beyond 5 Years	0
Letters of Credit | Environmental
Guarantor Obligations [Line Items]
Total Amounts Committed	398
Less Than 1 Year	398
1-3 Years	0
3-5 Years	0
Beyond 5 Years	0
Letters of Credit | Other
Guarantor Obligations [Line Items]
Total Amounts Committed	45,843
Less Than 1 Year	40,682
1-3 Years	5,161
3-5 Years	0
Beyond 5 Years	0
Surety Bonds
Guarantor Obligations [Line Items]
Total Amounts Committed	618,955
Less Than 1 Year	569,547
1-3 Years	49,408
3-5 Years	0
Beyond 5 Years	0
Surety Bonds | Employee-Related
Guarantor Obligations [Line Items]
Total Amounts Committed	87,424
Less Than 1 Year	69,889
1-3 Years	17,535
3-5 Years	0
Beyond 5 Years	0
Surety Bonds | Environmental
Guarantor Obligations [Line Items]
Total Amounts Committed	527,406
Less Than 1 Year	496,365
1-3 Years	31,041
3-5 Years	0
Beyond 5 Years	0
Surety Bonds | Other
Guarantor Obligations [Line Items]
Total Amounts Committed	4,125
Less Than 1 Year	3,293
1-3 Years	832
3-5 Years	0
Beyond 5 Years	0
Guarantees
Guarantor Obligations [Line Items]
Total Amounts Committed	14,654
Less Than 1 Year	7,348
1-3 Years	6,576
3-5 Years	398
Beyond 5 Years	332
Guarantees | Other
Guarantor Obligations [Line Items]
Total Amounts Committed	14,654
Less Than 1 Year	7,348
1-3 Years	6,576
3-5 Years	398
Beyond 5 Years	$ 332