Annual report pursuant to Section 13 and 15(d)

FAIR VALUE MEASUREMENTS (Fair Value of Assets Measured on Non-recurring Basis) (Details)

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FAIR VALUE MEASUREMENTS (Fair Value of Assets Measured on Non-recurring Basis) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Impairment charges related to definite-lived intangible assets $ 19,400   $ 26,751    
Goodwill impairment   $ 10,500 0 $ 10,500 $ 20,000
Fair Value, Nonrecurring [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Goodwill, fair value disclosure   20,332 0 20,332  
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Goodwill, fair value disclosure   0 0 0  
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Goodwill, fair value disclosure   0 0 0  
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Goodwill, fair value disclosure   $ 20,332 $ 0 $ 20,332