OTHER INVESTMENTS (Schedule of Receivables) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Schedule of Investments [Line Items]
Other investments, gross	$ 504,626	$ 276,715
Allowance for loss on other investments		(373)
Total other investments	504,626	276,342
Other Investment Note Due 2018 Through 2022 [Member]
Schedule of Investments [Line Items]
Other investments, gross	$ 40,242	15,115
Interest rate	9.91%
Other Investment Note Due 2018 Through 2022 [Member] | Minimum
Schedule of Investments [Line Items]
Maturity year	2018
Other Investment Note Due 2018 Through 2022 [Member] | Maximum
Schedule of Investments [Line Items]
Maturity year	2022
Other Investment Note Due2019 [Member]
Schedule of Investments [Line Items]
Other investments, gross	$ 131,452
Interest rate	9.35%
Maturity year	2019
Other Investment Note Due 2020 [Member]
Schedule of Investments [Line Items]
Other investments, gross	$ 71,036	49,490
Interest rate	13.06%
Maturity year	2020
Other Investment Note Due2023 interest at 7.32 [Member]
Schedule of Investments [Line Items]
Other investments, gross	$ 65,000	64,050
Interest rate	7.32%
Maturity year	2023
Other Investment Note Due2023 interest at 12.00 [Member]
Schedule of Investments [Line Items]
Other investments, gross	$ 59,454	49,708
Interest rate	12.00%
Maturity year	2023
Other Investment Note Due 2023 [Member]
Schedule of Investments [Line Items]
Other investments, gross	$ 59,500
Other Investment Note Due 2024 Through 2025 [Member]
Schedule of Investments [Line Items]
Other investments, gross	$ 46,287	31,987
Interest rate	8.38%
Other Investment Note Due 2024 Through 2025 [Member] | Minimum
Schedule of Investments [Line Items]
Maturity year	2024
Other Investment Note Due 2024 Through 2025 [Member] | Maximum
Schedule of Investments [Line Items]
Maturity year	2025
Other Investment notes outstanding
Schedule of Investments [Line Items]
Other investments, gross	$ 91,155	$ 66,365
Interest rate	8.06%