LONG-TERM DEBT AND OTHER FINANCING ARRANGEMENTS Other Credit Facilities and Capital Lease Obligations (Details) $ in Thousands, Kč in Millions		12 Months Ended
		Dec. 31, 2018 CZK (Kč)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Line of Credit Facility [Line Items]
Credit facilities	[1],[2],[3],[4]		$ 0	$ 0
Capital leases			15,891	10,193
Total credit facilities and capital leases			15,891	10,193
Less: current maturities			5,545	3,269
Total non-current credit facilities and capital leases			10,346	6,924
2019			0
2020			0
2021			240,834
2022			0
2023			536,776
2024 and thereafter			0
Total long-term debt and credit facilities			777,610
Debt issuance costs			(9,660)	(12,947)
Carrying amount of long-term debt and credit facilities			772,339
2019			5,824
2020			5,251
2021			3,853
2022			1,488
2023			0
2024 and thereafter			0
Total undiscounted payments			16,416
Less: amount representing interest			525
Present value of net minimum lease payments			15,891
BMG Bank Mendes Gans [Member]
Line of Credit Facility [Line Items]
Credit facilities			0	0
Line of credit facility cash pooling arrangment deposit			36,800	$ 12,500
CET 21 [Member] | Ceska Sporitelna [Member]
Line of Credit Facility [Line Items]
Line of credit facility maximum borrowing capacity		Kč 475.0	21,100
Factoring Fee, Percentage		0.19%
Debt instrument basis spread on variable rate		0.95%
CET 21 [Member] | Komercni Banka [Member] [Domain]
Line of Credit Facility [Line Items]
Line of credit facility maximum borrowing capacity		Kč 270.0	12,000
Factoring Fee, Percentage		0.11%
Debt instrument basis spread on variable rate		0.95%
Pro TV [Member] | Global Funds IFN S.A. [Member]
Line of Credit Facility [Line Items]
Factoring Fee, Percentage		4.00%
Debt instrument basis spread on variable rate		6.00%
Senior Debt and Credit Facilities [Member]
Line of Credit Facility [Line Items]
Debt issuance costs	[5]		$ (5,271)

[1] (3) Under a factoring framework agreement with Factoring KB, a.s., up to CZK 270.0 million (approximately US$ 12.0 million) of receivables from certain customers in the Czech Republic may be factored on a non-recourse basis. The facility has a factoring fee of 0.11% of any factored receivable and bears interest at one-month PRIBOR plus 0.95% per annum for the period that receivables are factored and outstanding up to a maximum of 60 days from the due date.

[2] (4) Under a factoring framework agreement with Global Funds IFN S.A., receivables from certain customers in Romania may be factored on a non-recourse basis. The facility has a factoring fee of 4.0% of any factored receivable and bears interest at 6.0% per annum from the date the receivables are factored to the due date of the factored receivable.

[3] Under a factoring framework agreement with Factoring Česka spořitelna, a.s., up to CZK 475.0 million (approximately US$ 21.1 million) of receivables from certain customers in the Czech Republic may be factored on a recourse or non-recourse basis. The facility has a factoring fee of 0.19% of any factored receivable and bears interest at one-month PRIBOR plus 0.95% per annum for the period that receivables are factored and outstanding.

[4] We have a cash pooling arrangement with Bank Mendes Gans (“BMG”), a subsidiary of ING Bank N.V. (“ING”), which enables us to receive credit throughout the group in respect of cash balances which our subsidiaries deposit with BMG. Cash deposited by our subsidiaries with BMG is pledged as security against the drawings of other subsidiaries up to the amount deposited.As at December 31, 2018, we had deposits of US$ 36.8 million in and no drawings on the BMG cash pool. Interest is earned on deposits at the relevant money market rate. As at December 31, 2017, we had deposits of US$ 12.5 million in and no drawings on the BMG cash pool.

[5] (1) Debt issuance costs related to the 2021 Euro Loan and 2023 Euro Loan are being amortized on a straight-line basis, which approximates the effective interest method, over the life of the respective instruments. Debt issuance costs related to the 2023 Revolving Credit Facility are classified as non-current assets in our consolidated balance sheet and are being amortized on a straight-line basis over the life of the 2023 Revolving Credit Facility.