USE OF DERIVATIVES, OFFSETTING DISCLOSURES AND CHANGES IN OTHER COMPREHENSIVE INCOME BY COMPONENT - Schedule of Swap Agreements Expiration Period and Characteristics (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Notional Disclosures [Abstract]
Swap Notional Amounts	$ 8,050,000
Interest Rate SWAP Currently-Paying Contracts Expiring First Quarter 2018 [Member]
Notional Disclosures [Abstract]
Swap Notional Amounts	$ 1,700,000
Average Fixed Rates	0.76%
Interest Rate SWAP Currently-Paying Contracts Expiring Second Quarter 2018 [Member]
Notional Disclosures [Abstract]
Swap Notional Amounts	$ 600,000
Average Fixed Rates	0.79%
Interest Rate SWAP Currently-Paying Contracts Expiring Third Quarter 2018 [Member]
Notional Disclosures [Abstract]
Swap Notional Amounts	$ 400,000
Average Fixed Rates	0.88%
Interest Rate SWAP Currently-Paying Contracts Expiring Fourth Quarter 2018 [Member]
Notional Disclosures [Abstract]
Swap Notional Amounts	$ 800,000
Average Fixed Rates	1.15%
Interest Rate SWAP Currently-Paying Contracts Expiring First Quarter 2019 [Member]
Notional Disclosures [Abstract]
Swap Notional Amounts	$ 950,000
Average Fixed Rates	1.58%
Interest Rate SWAP Currently-Paying Contracts Expiring Second Quarter 2019 [Member]
Notional Disclosures [Abstract]
Swap Notional Amounts	$ 1,650,000
Average Fixed Rates	1.33%
Interest Rate SWAP Currently-Paying Contracts Expiring Third Quarter 2019 [Member]
Notional Disclosures [Abstract]
Swap Notional Amounts	$ 550,000
Average Fixed Rates	1.40%
Interest Rate SWAP Currently-Paying Contracts Expiring Fourth Quarter 2019 [Member]
Notional Disclosures [Abstract]
Swap Notional Amounts	$ 700,000
Average Fixed Rates	1.72%
Interest Rate SWAP Currently-Paying Contracts Expiring First Quarter 2020 [Member]
Notional Disclosures [Abstract]
Swap Notional Amounts	$ 300,000
Average Fixed Rates	1.82%
Interest Rate SWAP Currently-Paying Contracts Expiring Third Quarter 2020 [Member]
Notional Disclosures [Abstract]
Swap Notional Amounts	$ 200,000
Average Fixed Rates	1.64%
Interest Rate SWAP Currently-Paying Contracts Expiring Fourth Quarter 2020 [Member]
Notional Disclosures [Abstract]
Swap Notional Amounts	$ 200,000
Average Fixed Rates	2.04%