OTHER INCOME (EXPENSE), NET (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Income and Expenses [Abstract]
Unrealized gain on equity securities and marketable securities									$ 2,488	$ 1,084	$ 0
Gift card and Club-O rewards breakage									0	0	2,742
Gain on investment in precious metals									0	0	1,971
Equity method losses									(7,734)	(3,869)	(508)
Impairment of equity securities									(7,090)	(536)	(5,487)
Impairment of notes receivable									(1,282)	0	0
Loss on sale of equity securities and marketable securities									(130)	0	0
Other									1,247	(167)	2,460
Total other income (expense), net	$ 1,547	$ (4,781)	$ (2,995)	$ (6,272)	$ (1,999)	$ (1,848)	$ 368	$ (9)	$ (12,501)	$ (3,488)	$ 1,178