REAL ESTATE - Investments (Details) $ in Thousands, ft² in Millions	Mar. 31, 2020 USD ($) ft² numberOfProperties	Jan. 31, 2020 numberOfProperties
Real Estate Properties [Line Items]
Percentage of real estate occupied	81.00%
Real estate | $	$ 878,572
Office Properties
Real Estate Properties [Line Items]
Number of real estate properties	4
Office Campus
Real Estate Properties [Line Items]
Number of real estate properties	1
Office Campus | Held-for-sale
Real Estate Properties [Line Items]
Number of real estate properties		1
Office Buildings, Campus
Real Estate Properties [Line Items]
Number of real estate properties	5
Office Buildings, Campus | Held-for-sale
Real Estate Properties [Line Items]
Number of real estate properties	5
Rentable square feet | ft²	2.7