USE OF DERIVATIVES, OFFSETTING DISCLOSURES AND CHANGES IN OTHER COMPREHENSIVE INCOME BY COMPONENT - Schedule of Swap Agreements Expiration Period and Characteristics (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Notional Disclosures [Abstract]
Notional Amount	$ 7,550,000
Interest Rate SWAP Currently-Paying Contracts Expiring Third Quarter 2019 [Member]
Notional Disclosures [Abstract]
Notional Amount	$ 550,000
Average Fixed-Rate Payment Requirement	1.40%
Interest Rate SWAP Currently-Paying Contracts Expiring Fourth Quarter 2019 [Member]
Notional Disclosures [Abstract]
Notional Amount	$ 700,000
Average Fixed-Rate Payment Requirement	1.72%
Interest Rate SWAP Currently-Paying Contracts Expiring First Quarter 2020 [Member]
Notional Disclosures [Abstract]
Notional Amount	$ 600,000
Average Fixed-Rate Payment Requirement	2.07%
Interest Rate SWAP Currently-Paying Contracts Expiring Second Quarter 2020 [Member]
Notional Disclosures [Abstract]
Notional Amount	$ 600,000
Average Fixed-Rate Payment Requirement	2.68%
Interest Rate SWAP Currently-Paying Contracts Expiring Third Quarter 2020 [Member]
Notional Disclosures [Abstract]
Notional Amount	$ 200,000
Average Fixed-Rate Payment Requirement	1.64%
Interest Rate SWAP Currently-Paying Contracts Expiring Fourth Quarter 2020 [Member]
Notional Disclosures [Abstract]
Notional Amount	$ 200,000
Average Fixed-Rate Payment Requirement	2.04%
Interest Rate SWAP Currently-Paying Contracts Expiring First Quarter 2021 [Member]
Notional Disclosures [Abstract]
Notional Amount	$ 100,000
Average Fixed-Rate Payment Requirement	2.67%
Interest Rate SWAP Currently-Paying Contracts Expiring Second Quarter 2021 [Member]
Notional Disclosures [Abstract]
Notional Amount	$ 800,000
Average Fixed-Rate Payment Requirement	1.95%
Interest Rate SWAP Currently-Paying Contracts Expiring First Quarter 2022 [Member]
Notional Disclosures [Abstract]
Notional Amount	$ 2,500,000
Average Fixed-Rate Payment Requirement	2.54%
Interest Rate SWAP Currently-Paying Contracts Expiring Second Quarter 2022 [Member]
Notional Disclosures [Abstract]
Notional Amount	$ 1,300,000
Average Fixed-Rate Payment Requirement	2.30%