NOTES PAYABLE AND COMMERCIAL BANK FINANCING - Bank Credit Agreement Narrative (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Jan. 03, 2017	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016	[1]
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs, net			$ 32,981	$ 39,047
Loss on extinguishment of debt			$ 0	$ 1,404	[1]	$ 23,699
Threshold percentage of aggregate broadcast cash flows used for defining material third-party licensees			20.00%
Bank Credit Agreement
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs, net	$ 11,600
Unamortized debt discount	3,400
Amortization of financing costs	7,700
Debt issuance costs	$ 500
Loss on extinguishment of debt		$ 1,400

[1] See Recent Accounting Pronouncements within Note 1. Nature of Operations and Summary of Significant Accounting Policies for a discussion of the adoption of new accounting principles related to the classification of certain cash receipts and cash payments.