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INVESTMENTS - Summary of Investments (Details) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Available-for-sale securities		$ 25,646	$ 26,785
Total investments		129,373	135,189
Convertible Debt Securities
Schedule of Equity Method Investments [Line Items]
Available-for-sale securities		11,070	11,354
Redeemable Preferred Stock
Schedule of Equity Method Investments [Line Items]
Available-for-sale securities		14,576	15,431
Fair Value Option Investments
Schedule of Equity Method Investments [Line Items]
Equity method investments		77,933	82,966
Other Equity Investments
Schedule of Equity Method Investments [Line Items]
Equity method investments	[1]	$ 25,794	$ 25,438
Minimum
Schedule of Equity Method Investments [Line Items]
Available for sale securities, percent ownership of voting stock		19.00%	19.00%
Minimum | Fair Value Option Investments
Schedule of Equity Method Investments [Line Items]
Equity method investment, percent ownership of voting stock		10.00%	10.00%
Minimum | Other Equity Investments
Schedule of Equity Method Investments [Line Items]
Equity method investment, percent ownership of voting stock		1.00%	1.00%
Maximum
Schedule of Equity Method Investments [Line Items]
Available for sale securities, percent ownership of voting stock		25.00%	25.00%
Maximum | Fair Value Option Investments
Schedule of Equity Method Investments [Line Items]
Equity method investment, percent ownership of voting stock		19.00%	19.00%
Maximum | Other Equity Investments
Schedule of Equity Method Investments [Line Items]
Equity method investment, percent ownership of voting stock		19.00%	19.00%
[1] Represents equity investments without readily determinable fair values. Those investments were previously accounted for using the cost method of accounting. Under the cost method, investments were carried at cost and adjusted only for other-than-temporary declines in fair value, certain distributions and additional investments. The Company adopted the guidance in ASU 2016-01 on January 1, 2018. Under that guidance, the Company has elected to record equity investments without readily determinable fair values at cost adjusted for observable price changes and impairments. There were no adjustments for observable price changes or impairments related to these investments for the three months ended March 31, 2018.

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