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ACQUISITIONS (Narrative) (Details) - USD ($) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 22, 2019 | Feb. 21, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  | $ 1,882,020,000 | $ 1,611,535,000 | $ 1,283,457,000
Goodwill, expected tax deductible amount |  |  | $ 166,000,000 |  |
Trade name |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Weighted-average amortization period |  |  | 12 years |  |
STR Inc and STR Global Ltd |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Aggregate purchase price | $ 435,000,000 |  |  |  |
Goodwill | 261,436,000 |  |  |  |
Transaction costs | 2,000,000 |  |  |  |
Employee retention bonus | $ 15,000,000 |  |  |  |
Period for retention payments | 1 year |  |  |  |
STR Inc and STR Global Ltd | North America |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill | $ 159,000,000 |  |  |  |
STR Inc and STR Global Ltd | International |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill | $ 102,000,000 |  |  |  |
ForRent, Division Of DE Holdings, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Aggregate purchase price |  | $ 376,000,000 |  |  |
Goodwill |  | 266,595,000 |  |  |
Transaction costs |  | 3,000,000 |  |  |
Employee retention bonus |  | 12,000,000 |  |  |
Cash payment |  | $ 340,000,000 |  |  |
Investment owned (shares) |  | 103,280 |  |  |
Purchase price, shares issued |  | $ 36,000,000 |  |  |
Goodwill, expected tax deductible amount |  | 8,000,000 |  |  |
Indemnification asset |  | 6,260,000 |  |  |
State uncertain income tax position liability |  | 2,047,000 |  |  |
Sales taxes |  | 5,000,000 |  |  |
Reversed tax liabilities due to time lapse |  |  | $ 900,000 | 500,000 |
Uncertain income tax position liability and related indemnification asset recognized as of the acquisition |  |  | $ 600,000 | $ 900,000 |
ForRent, Division Of DE Holdings, Inc. | Maximum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
State uncertain income tax position liability |  | 2,000,000 |  |  |
ForRent, Division Of DE Holdings, Inc. | North America |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  | $ 267,000,000 |  |  |
ForRent, Division Of DE Holdings, Inc. | Customer base |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Weighted-average amortization period |  | 10 years |  |  |
ForRent, Division Of DE Holdings, Inc. | Database Rights |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Weighted-average amortization period |  | 3 years |  |  |
ForRent, Division Of DE Holdings, Inc. | Trade name |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Weighted-average amortization period |  | 10 years |  |  |
ForRent, Division Of DE Holdings, Inc. | Building Photography |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Weighted-average amortization period |  | 1 year |  |  |

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