LAND AND SUBSURFACE INTERESTS - Daytona Beach, Florida Land (Details)		3 Months Ended						9 Months Ended
	Oct. 31, 2019 a	Sep. 30, 2019 a property mi	Jun. 30, 2019 a	Mar. 31, 2019 a	Sep. 30, 2018 a	Jun. 30, 2018 a	Mar. 31, 2018 a	Sep. 30, 2019 a property mi	Sep. 30, 2018 a
Land and development costs and subsurface interests
Area of land sales as a percentage of land holdings	30.00%
Land sale acres	1,500	2.2	64.3	9.9	24.1	32.4	34.9	76.4	91.4
Undeveloped Land in Daytona Beach, Florida, Along Interstate 95
Land and development costs and subsurface interests
Area of land (in acres)		5,300						5,300
Distance of land owned along Interstate | mi		6						6
Property east of I-95
Land and development costs and subsurface interests
Area of land (in acres)		800						800
Distance of land owned along Interstate | mi		6						6
Property west of I-95
Land and development costs and subsurface interests
Area of land (in acres)		4,500						4,500
Property west of Interstate 95 and north of Interstate 4
Land and development costs and subsurface interests
Area of land (in acres)		1,000						1,000
Property west of Interstate 95 and north of Interstate 4, parcel one
Land and development costs and subsurface interests
Area of land (in acres)		850						850
Property west of Interstate 95 and north of Interstate 4, smaller parcels
Land and development costs and subsurface interests
Number of land parcels | property		3						3