COMMITMENTS AND CONTINGENCIES Operating Lease Payments (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2018		$ 2,830
2019		761
2020		371
2021		349
2022		346
2023 and thereafter		1,728
Total		6,385
Purchase Commitment [Member]
Long-term Purchase Commitment [Line Items]
2018		33,308
2019		28,700
2020		17,910
2021		13,077
2022		2,587
2023 and thereafter		3,558
Total		99,140	$ 114,300
Transmission Service Agreement [Member]
Long-term Purchase Commitment [Line Items]
2018	[1]	14,983
2019	[1]	11,827
2020	[1]	2,030
2021	[1]	161
2022	[1]	139
2023 and thereafter	[1]	12
Total	[1]	29,152
Machinery and Equipment [Member]
Long-term Purchase Commitment [Line Items]
2018		1,273
2019		0
2020		0
2021		0
2022		0
2023 and thereafter		0
Total		$ 1,273

[1] (1) Other commitments are primarily comprised of digital transmission commitments.