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ACQUISITIONS (Schedule of Recognized Identified Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Oct. 22, 2019 | Dec. 31, 2018 | Feb. 21, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |
Goodwill | $ 1,882,020 |  | $ 1,611,535 |  | $ 1,283,457
STR Inc and STR Global Ltd |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash and cash equivalents |  | $ 11,710 |  |  |
Accounts receivable |  | 8,067 |  |  |
Lease right-of-use assets |  | 7,306 |  |  |
Goodwill |  | 261,436 |  |  |
Intangible assets |  | 178,000 |  |  |
Lease liabilities |  | (7,306) |  |  |
Deferred revenue |  | (10,966) |  |  |
Deferred tax liabilities |  | (7,980) |  |  |
Other assets and liabilities |  | (4,815) |  |  |
Fair value of identifiable net assets acquired |  | $ 435,452 |  |  |
ForRent, Division Of DE Holdings, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash and cash equivalents |  |  |  | $ 59 |
Accounts receivable |  |  |  | 8,769 |
Indemnification asset |  |  |  | 5,443 |
Goodwill |  |  |  | 266,595 |
Intangible assets |  |  |  | 141,300 |
Deferred tax liabilities |  |  |  | (34,032) |
Contingent sales tax liability |  |  |  | (6,260) |
State uncertain income tax position liability |  |  |  | (2,047) |
Other assets and liabilities |  |  |  | (3,535) |
Fair value of identifiable net assets acquired |  |  |  | $ 376,292 |

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