FAIR VALUE MEASUREMENTS - Balance Sheet Grouping (Details) - USD ($) $ in Thousands |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
---|---|---|---|---|
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
Cash and cash equivalents | $ 384,572 | $ 432,954 | $ 440,430 | $ 490,279 |
Carrying Amount | ||||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
Cash and cash equivalents | 384,572 | 432,954 | ||
Carrying Amount | Mortgages | ||||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
Mortgages payable | 1,597,397 | 1,556,248 | ||
Unamortized debt issuance costs | (9,900) | (10,100) | ||
Fair Value | ||||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
Cash and cash equivalents | 384,572 | 432,954 | ||
Fair Value | Mortgages | ||||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
Mortgages payable | $ 1,611,868 | $ 1,590,503 |