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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Fair value measurements
Strategic investments	$ 18,107	$ 2,000
Cost method investments	20,100
Carrying Value
Fair value measurements
Long-term debt	159,700		$ 156,800
Significant Other Observable Inputs (Level 2) | Estimated Fair Value
Fair value measurements
Long-term debt	163,100		159,900
Recurring basis
Fair value measurements
Total assets measured at fair value			68,636
Recurring basis | Certificate of deposit
Fair value measurements
Cash and cash equivalents			391
Recurring basis | Money market funds
Fair value measurements
Cash and cash equivalents			29,027
Recurring basis | Short Term Investments
Fair value measurements
Investments			9,237
Recurring basis | Commercial paper
Fair value measurements
Investments			29,981
Recurring basis | Quoted Prices in Active Markets (Level 1)
Fair value measurements
Total assets and liabilities measured at fair value	2,658
Total assets measured at fair value			30,778
Recurring basis | Quoted Prices in Active Markets (Level 1) | Money market funds
Fair value measurements
Cash and cash equivalents	2,287		29,027
Recurring basis | Quoted Prices in Active Markets (Level 1) | Short Term Investments
Fair value measurements
Investments	371		1,751
Recurring basis | Significant Other Observable Inputs (Level 2)
Fair value measurements
Total assets and liabilities measured at fair value	57,942
Total assets measured at fair value			37,858
Recurring basis | Significant Other Observable Inputs (Level 2) | Interest rate swap
Fair value measurements
Derivative liabilities	(42)
Recurring basis | Significant Other Observable Inputs (Level 2) | Certificate of deposit
Fair value measurements
Cash and cash equivalents	391		391
Recurring basis | Significant Other Observable Inputs (Level 2) | Short Term Investments
Fair value measurements
Investments	7,486		7,486
Recurring basis | Significant Other Observable Inputs (Level 2) | Commercial paper
Fair value measurements
Investments	50,107		$ 29,981
Recurring basis | Unobservable Inputs (Level 3)
Fair value measurements
Total assets and liabilities measured at fair value	60,600
Recurring basis | Unobservable Inputs (Level 3) | Interest rate swap
Fair value measurements
Derivative liabilities	(42)
Recurring basis | Unobservable Inputs (Level 3) | Certificate of deposit
Fair value measurements
Cash and cash equivalents	391
Recurring basis | Unobservable Inputs (Level 3) | Money market funds
Fair value measurements
Cash and cash equivalents	2,287
Recurring basis | Unobservable Inputs (Level 3) | Short Term Investments
Fair value measurements
Investments	7,857
Recurring basis | Unobservable Inputs (Level 3) | Commercial paper
Fair value measurements
Investments	$ 50,107

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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