Quarterly report pursuant to Section 13 or 15(d)

REVENUE RECOGNITION (Sponsorship & Advertising Revenue) (Details)

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REVENUE RECOGNITION (Sponsorship & Advertising Revenue) (Details) - Sponsorship & Advertising [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disaggregation of Revenue [Line Items]    
Revenue $ 74,559 $ 63,988
Percentage of Sponsorship & Advertising revenue to consolidated revenue 5.00% 5.10%