Annual report pursuant to Section 13 and 15(d)

QUARTERLY RESULTS OF OPERATIONS (Unaudited) (Narrative) (Details)

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QUARTERLY RESULTS OF OPERATIONS (Unaudited) (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]            
Impairment charges related to definite-lived intangible assets $ 19,400     $ 26,751    
Impairment     $ 10,500 0 $ 10,500 $ 20,000
Net foreign currency transaction gains / (losses)   $ (8,400)   $ 3,200 $ 3,100 $ (11,600)