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COMMON SHARES - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  | 1 Months Ended | 4 Months Ended | 7 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 01, 2021 | Apr. 08, 2021 | Jun. 15, 2020 | Mar. 26, 2020 | Mar. 23, 2020 | Dec. 30, 2019 | Mar. 31, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity offering (in shares) |  |  | 6,000,000 |  |  |  |  | 5,980,000 |  |  |  |  |  |
Price per share (in dollars per share) |  |  | $ 86.26 |  |  |  |  |  |  |  |  |  |  |
Net proceeds from common shares issued directly by the Company |  |  | $ 509,200 | $ 314,100 | $ 105,700 |  |  |  | $ 929,000 | $ 852,300 | $ 0 | $ 928,992 | $ 852,254 |
Common shares issuable pursuant to forward sale agreement (in shares) |  |  | 11,960,000 | 4,460,000 | 1,500,000 |  |  |  |  |  |  |  | 6,000,000 |
Forward sale price (in dollars per share) |  |  |  |  |  | $ 71.48 |  |  |  |  |  |  |  |
Common shares issued directly by the Company (in shares) |  |  |  |  |  |  | 5,960,000 |  |  |  |  |  |  |
Treasury stock (in shares) |  |  |  |  |  |  |  |  |  |  | 13,415,206 | 14,864,379 |  |
Common stock outstanding (in shares) |  |  |  |  |  |  |  |  |  |  | 344,403,196 | 342,954,023 |  |
Issuance of Treasury Shares for Acquisition of New England Service Company | $ 38,100 | $ 38,051 |  |  |  |  |  |  |  |  |  |  |  |
Common Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares issued directly by the Company (in shares) |  |  |  |  |  |  |  |  |  |  |  | 11,960,000 | 11,980,000 |
Common stock outstanding (in shares) |  |  |  |  |  |  |  |  |  | 329,880,645 | 344,403,196 | 342,954,023 | 329,880,645 | 316,885,808
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Treasury Shares for Acquisition of New England Service Company (in shares) | 462,517 |  |  |  |  |  |  |  |  |  |  |  |  |

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