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)
 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
business
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Goodwill impairment $ 10,500,000 $ 20,000,000 $ 10,500,000 $ 20,000,000 $ 0
Number of impaired nonconsolidated affiliates | business         2
Fair Value, Measurements, Nonrecurring [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Goodwill, Fair Value Disclosure 20,332,000 30,832,000 20,332,000 30,832,000  
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Goodwill, Fair Value Disclosure 0 0 0 0  
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Goodwill, Fair Value Disclosure 0 0 0 0  
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Goodwill, Fair Value Disclosure $ 20,332,000 $ 30,832,000 $ 20,332,000 $ 30,832,000